MCWP 3-16.6

Supporting Arms Observer,

 Spotter, and Controller

U.S. Marine Corps 

PCN 143 000060 00 
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DEPARTMENT OF THE NAVY

Headquarters United States Marine Corps

Washington, DC 203 80-1775

20 November 1998

FOREWORD

1. PURPOSE

Marine Corps Warfighting Publication (MCWP) 3-16.6, Supporting

Arms Observer, Spotter, and Controller, provides the techniques and

procedures for requesting and adjusting supporting arms.

2. SCOPE

This publication provides techniques and procedures for requesting,

adjusting, and controlling mortars, artillery, naval gunfire, and close air

support. It is intended as a field reference for supporting arms observers

(mortar and artillery forward observers, naval gunfire spotters, and

forward air controllers) and as a study guide and field reference for

personnel seeking information on supporting arms procedures.

3. SUPERSESSION

Fleet Marine Force Manual (FMFM) 6-8, Supporting Arms Observer,

Spotter, and Controller, dated 24 June 1994.

4. CERTIFICATION

Reviewed and approved this date.
BY DIRECTION OF THE COMMANDANT OF THE MARINE CORPS

J.E. RHODES

Lieutenant General, U.S. Marine Corps

Commanding General

Marine Corps Combat Development Command

DISTRIBUTION: 143 000060 00
Supporting Arms Observer, Spotter, and

Controller

Table of Contents

Page

Introduction

Chapter 1. Supporting Arms Observers, Spotters, and

Controllers

Section I. Artillery Forward Observer Team

1101 Responsibilities 1-2

1102 Communications 1-5

Section II. 81-mm Mortar Forward Observer

1201 Responsibilities 1-9

1202 Communications 1-10

Section Ill. Naval Gunfire Spot Team

1301 Responsibilities 1-11

1302 Communications 1-12

III
iv

Section IV. Forward Air Control Party

1401 Responsibilities 1-14

1402 Communications 1-15

Section V. Employing Supporting Arms Observers, Spotters, and Controllers

1501 Offensive Operations 1-18

1502 Defensive Operations 1-21

1503 Patrols 1-22

1504 Retrograde Operations 1-22

Chapter 2. Target Location

Section!. Elements and Tools of Target Location

2101 Map Reading 2-1

2102 Direction 2-2

2103 Determining Angular Deviation 2-7

2104 Distance 2-11

2105 Altitude 2-18

2106 Tools To Assist the Observer 2-19

Section II. Methods of Target Location

2201 Polar Plot 2-35

2202 Grid Coordinates 2-38

2203 Shift From a Known Point 2-39
2204 Locating Targets in Mobile Operations 2-42

Chapter 3. Requesting and Adjusting Artillery, Mortars,

and Naval Gunfire

Section I. Artillery and Mortar Call for Fire

3101 Elements of the Call for Fire 3-1

3102 Observer Identification and Warning Order 3-2

3103 Target Location 3-4

3104 Target Description, Method of 3-6

Engagement, and Method of Fire and Control

3105 Call for Fire for Suppressive Fire 3-16

3106 Direction 3-18

3107 Message to Observer 3-18

3108 Authentication 3-21

3109 Report Upon Firing 3-23

3110 Correction of Errors 3-34

3111 Call for Fire From Headquarters Higher 3-24

Than Battalion

Section II. Naval Gunfire Call for Fire

3201 Fire Unit Status 3-25

3202 Elements of the Call for Fire 3-25

3203 Spotter Identification, Warning Order, and 3-26

Target Number

V
vi

3204 Target Location, Target Description, 3-27

Method of Engagement, and Method of

Control

3205 Report Upon Firing 3-39

3206 Correction of Errors 3-39

Section UI. Adjustment of Fire

3301 Spottings 3-41

3302 Corrections 3-47

3303 Fire-for-Effect Phase 3-57

3304 Naval Gunfire Adjustment Procedures 3-61

3305 Adjusting Artillery Air Bursts 3-64

3306 Adjusting Naval Gunfire Air Bursts 3-68

Chapter4. Requesting and Controlling Close Air

Support

4001 Types of Close Air Support 4-1

4002 Levels of Threat 4-2

4003 Airspace Control Measures 4-3

4004 Coordination Techniques 4-7

4005 Aircraft Ordnance 4-9

4006 Close Air Support Request and Control 4-13

Procedures

4007 Request 4-13

4008 Brief 4-22

4009 Time 4-24
4010 Mark, Adjustment, and Control of Initial 4-27

Aircraft

4011 Adjustment and Control of Subsequent 4-33

Aircraft

4012 Reattacks 4-33

4013 Reasonable Assurance 4-34

4014 The Report 4-35

4015 Air-Delivered Ordnance in Vicinity of 4-36

Friendly Troops

4016 Emergency Procedures for Requesting 4-38

Close Air Support

Chapter 5. Artillery and Mortar Special Situations

Section I. Artillery and Mortar High-Angle Fire

5101 Procedures 5-1

Section II. Artillery and Mortar Precision Fire

5201 Artillery Registration Missions 5-2

5202 Precision Registration for Mortars 5-13

5203 Destruction Missions 5-16

Section III. Artillery High-Burst or Mean Point of Impact

Registrations

5301 General 5-18

5302 Procedures for High-Burst Registration 5-19

VII
vi"

5303 Procedures for Mean Point of Impact 5-25

Registration

Section IV. Artillery Improved Conventional Munitions

5401 Antipersonnel Round 5-26

5402 Dual-Purpose Round 5-27

5403 Dispersion 5-28

5404 Improved Conventional Munitions Call for 5-29

Fire and Adjustment

5405 Employment Considerations 5-32

Section V. Artillery Family of Scatterable Mines

5501 Remote Antiarmor Mine System Projectiles 5-33

5502 Area Denial Artillery Munitions Projectiles 5-33

5503 Types of Minefields 5-34

5504 Target Location 5-35

5505 Family of Scatterable Mines Call for 5-36

Fire and Adjustment

5506 Employment Considerations 5-37

Section VI. Artillery and Mortar Illumination

5601 Employment of Illumination 5-38

5602 Illumination Patterns 5-39

5603 Illumination Call for Fire and Adjustment 5-42

5604 Coordinated Illumination 5-45

5605 Continuous Illumination 5-47
Section VII. Smoke

5701 Categories of Smoke 5-48

5702 Battlespace Applications 5-48

5703 Delivery Systems 5-49

5704 Smoke Planning Considerations 5-52

5705 Types of Smoke Missions 5-62

5706 Safety Considerations 5-72

Section VIII. Artillery and Mortar Final Protective Fires

5801 Employment of Final Protective Fires 5-74

5802 Final Protective Fire Procedures 5-74

Section IX. Nonstandard Procedures for Artillery and

Mortars

5901 Adjustment of Fires by Sound 5-79

5902 Multiple Missions 5-81

5903 Auxiliary Adjusting Point 5-81

5904 Disoriented Observer 5-82

5905 Irregulai-Shaped Targets 5-83

5906 Emergency Observer Procedures 5-85

Chapter 6. Naval Gunfire Special Situations

6001 Illumination 6-1

6002 Smoke 6-8

ix
x

6003 Fresh Target Shift 6-8

6004 New Target Shift 6-12

6005 Simultaneous Engagement of Two Targets 6-12

6006 Firing on a Recorded Target 6-13

6007 Destructive Fire 6-14

6008 Massed Fire 6-14

6009 Special Naval Gunfire Commands and 6-15

Reports

Chapter 7. Aerial Observation

7001 Aerial Observer 7-1

7002 Prelaunch Considerations 7-1

7003 Reporting In and Out 7-2

7004 Call for Fire 7-6

7005 Adjustment of Fire 7-9

7006 Forward Looking Infrared Receiver 7-10

7007 Laser Designators 7-11

Chapter8. Suppression of Enemy Air Defenses

8001 SEAD Coordination 8-1

8002 Planned SEAD Missions 8-2

8003 Immediate SEAD Missions 8-2

8004 SEAD Decisionmaking 8-3

8005 Separation Techniques 8-6

8006 Airspace Control Measures 8-17
8007 Target Marking for Close Air Support 8-18

Aircraft

8008 Artillery SEAD 8-20

8009 Naval Gunfire SEAD 8-29

Chapter 9. Laser Designators and Laser-Guided

Weapons Systems

9001 Purpose 9-1

9002 Basic Requirements 9-1

9003 Laser Emission Systems 9-2

9004 Laser Acquisition Devices 9-4

9005 Laser-Guided Munitions 9-5

9006 Laser Energy Reflectivity 9-7

9007 Laser-Guided-Munition Planning 9-13

9008 Methods of Employment 9-18

9009 Employment Considerations 9-19

9010 Copperhead Engagement Characteristics 9-22

9011 Copperhead Call for Fire 9-30

9012 Message to Observer 9-33

9013 Trigger Points 9-33

9014 Copperhead Engagement Commands 9-37

9015 Survey Control 9-39

9016 Laser Polar Missions 9-48

9017 Target Shifts 9-50

9018 Registrations with MULEs 9-51

9019 MULE Employment by the Naval 9-52

Gunfire Spot Team

xi
xl'

9020 AN/GVS-5 Laser Rangefinder Employment 9-53

Appendixes:

A Target Analysis and Munitions Effects

B Crater Analysis

C Observation Post

D Timing the Delivery of Fire Support

E Construction of the Visibility Diagram

F Weapons Reference Data

G Glossary

H Notes
Introduction

The technology and organizations for providing supporting arms

today are products of our training and operational experience over

the past 100 years. Initial techniques for controlling fires of

artillery and naval rifles were limited to direct fire, where the crew

of the weapon had to see the target. This was primarily because of

the lack of a long-range observation and communications

capability. These crude measures for controlling fires could prove

hazardous to friendly as well as enemy forces, as the Marines

found out during operations in Cuba during the Spanish-American

War.

On June 14 [1898] Captain George F. Elliott led two infantry

companies and a detachment of fifty Cuban scouts on a circular

six-mile march toward Cuzco Well [location of a Spanish

camp]. Although the Marines did not surprise the Spanish

garrison of battalion strength, they won the foot race to the hill

that dominated the Spanish camp and caught the enemy in the

valley. At ranges up to 1,000 yards the Marines peppered the

Spaniards with rifle and machine gun fire. During the fighting

another Marine platoon on outpost duty on its own initiative

closed off the head of the valley and caught the enemy in a

crossfire, while the dispatch ship Dolphin added its shells to the

general firing. The Dolphin's shells, fired without much

direction, also drove the Marine platoon from its position until

the shelling was stopped by a wigwag message from Sergeant

John H. Quick.'

XIII
xiv

Experiences in the first World War exposed Marines to the realities

of trench warfare with modern weapons. Potent fire support was

crucial to advancing against an enemy who was firmly entrenched

in supporting defensive positions. This support was provided by

U.S. Army and allied artillery because Marine artillery units did

not deploy to France.2 Although techniques for controlling indirect

fire had progressed, their responsiveness and 'flexibility in

changing situations were still hampered by a lack of portable,

reliable communications. This deficiency would eventually be

overcome by the introduction of tactical radios.

Marine aviation began in 1913 when 1 stLt Alfred A. Cunningham

was designated as naval aviator number 5. Marine aviation's first

involvement in combat occurred in the latter part of World War I

during which it conducted aerial observation and bombing

missions as part of the Allied air effort. Marine aviation's first

independent mission was flown in 1918 against a German-held

railyard in Belgium.3 Marine aircraft were used for a variety of

missions from resupplying remote patrols and outposts to

providing close air support (CAS) to ground units in the "Banana

Wars" during the 1 920s. Communications between ground forces

and aircraft, although generally effective against the guerrillas,

were anything but sophisticated.

Although Marine aircraft were equipped with radio, the

prohibitive weight of early sets, coupled with the poor

transmission characteristics amid the terrain of Nicaragua meant

that most were removed from planes to permit carrying more

fuel and weapons. "Communication with ground troops,"
then-Captain Mathew B. Ridgeway, an Army observer in

Nicaragua, reported, "has been almost entirely by Very Pistol,

pick-up and drop messages, and panels."4

The lessons learned from using aircraft to attack ground targets and

the need for close coordination between the Marine in the air and

the Marine on the ground during these actions were reflected in the

Marine Corps Small Wars Manual of 1940.

In order to secure the full measure of cooperation between the

air and ground forces, it is necessary that each understands the

problems of the other. The aviator must know something of the

tactics of the ground patrol, and he must be ready and willing to

assume any justified risk to assist the ground commander. On

the other hand, the ground commander should understand the

hazards and limitations imposed on aviation operating over

difficult terrain, and should not expect the impossible.5

This sense of teamwork and the initial procedures for controlling

CAS developed between the World Wars would be put to the test

during operations in the Pacific during World War II.

World War II provided Marines with the opportunity to make

major developments in the techniques for controlling supporting

arms. It was an evolutionary process. Marine artillery expanded

from the organic regiments of each division to include heavy

artillery assigned to the amphibious corps. Marine artillery was

used to provide direct fire on enemy bunkers throughout the war,

and forward observers (FOs) called for and adjusted indirect fire in

support of maneuver units.

xv
xvi

Recognizing the need to improve the employment of naval gunfire

(NOF) in support of Marine ground forces, LtGen Holland Smith

organized an NGF section at V Amphibious Corps in late 1943.

.the Naval Gunfire Section turned Kahoolawe Island, Hawaii,

into a ship gunnery school and eventually supervised the

qualification firing for 532 Pacific Fleet warships. The training

exercises dramatized the need for intelligent gunfire spotting.

The NGF Section first stressed putting trained Marine ground

officers into spotting aircraft but then shifted to training Navy

and Marine officer spotting teams for ground employment.6

In October of 1944, LtGen Smith formed the Marine Air Support

Control Unit, which was commanded by Col Vernon Mcgee. The

unit provided CAS training and expanded the ability of landing

force commanders to plan and direct airstrikes.

The final step in improving close air support—actually directing

the strikes from the front lines against targets close to friendly

troops—also originated with Mcgee's command. Equipped with

improved jeep-mounted radios, Marine air controllers argued,

they could direct strikes against ground targets within hundreds

(rather than thousands) of yards of American troops by

communicating directly with the aircraft. This technique, which

ran counter to Navy and Army doctrine, required air strike

controllers well versed in ground tactics and aircraft capabilities.

At first the forward air controllers were air-indoctrinated ground

officers, but the Air Liaison Parties (ALPs) soon became the

instrument of pilots-turned-infantrymen. This reform proved

successful for the Army in the Philippines and the Marine Corps

on Okinawa.7
These techniques for effectively coordinating and controlling the

fires from various fire support agencies (mortars, artillery, NGF,

and CAS) reflected the lessons learned from three years of intense

combat across the Pacific and formed the basis for the Marine

Corps' current procedures for controlling supporting arms.

Although they would continue to be refined, the basic concepts

have remained valid to this day. Although the use of semaphore

has given way to data burst transmissions, the requirement for a

Marine who is capable of controlling the fires of supporting arms

remains crucial to success in combined-arms operations.

This publication contains the techniques and procedures used by

artillery and mortar FOs, NGF spotters, and forward air controllers

(FACs) to request, adjust, and control supporting arms. It is no

accident that the techniques for these three supporting arms are

covered in the same publication. The doctrine of combined arms

requires the full integration of arms. We take advantage of the

complementary capabilities of different types of supporting arms to

enhance mobility and firepower. To avoid the effects of one arm,

the enemy makes himself vulnerable to another. Achieving

proficiency in combined arms requires a building-block approach

to training that progresses from individual skills to unit skills and

culminates at the Marine air-ground task force (MAGTF) level.

Supporting arms observers, spotters, and controllers should be

cross-trained in the techniques contained in this publication (i.e.,

the FOs should be trained to control CAS just as FACs should be

capable of calling for and adjusting artillery and NGF). The

techniques explained in this publication are fundamental for

employing Marine Corps fire support. The most detailed and

xvii
XVIII

thorough fire support plans are useless without Marines who are

skilled in the techniques and procedures for bringing the effects of

firepower down on the enemy.
Chapter 1

Supporting Arms Observers, Spotters, and Controllers

The Marine Corps has four organizations that provide a maneuver

company with observers, spotters, and controllers who are

specifically trained to plan, call for, adjust, and control supporting

arms. They are the artillery FO team, 81 -mm mortar FO, NGF spot

team, and forward air control party (FACP). Whether a company

has one organization or all four attached for an operation (or phase

of an operation) depends on the situation and mission.

Section I. Artillery Forward Observer Team

Each firing battery of the artillery battalion has three FO teams.

One of these teams is provided to each company-sized unit/element

of the supported force. The number of FO teams may vary with the

composition of the force and structure limitations. The FO team is

led by a Marine lieutenant who is trained in fire support

coordination and advises the company commander on the

employment of fire support assets. The FO team plans and

coordinates artillery fires with the fires of other supporting arms at

the company level. It is trained to adjust artillery, rockets, mortars,

and NGF, as well as report battlespace information. The FO team

can operate within a maneuver element or from an artillery

observation post (OP).

1-1
1-2

An FO team's composition may vary with the mode of operation,

availability of personnel, and type of force supported, for example,

a mechanized unit with limited vehicle space or with a footmobile

unit. (See table 1-1 below and table 1-2 on page 1-3 for the

personnel and notional equipment of an FO team.)

Table 1-1. Artillery Forward Observer Team Personnel.

Position/Rank/Military Occupational

Specialty_(MOS)

Number

FOJlieutenantiO8O2 1

Fire support man/lance corporal/0861 1

Radio operator/corporal/2531 I

Radio operator/private/2531 1 1101. Responsibilities. The primary responsibility of the FO is to

plan and coordinate supporting fires at the company level. The FO

team locates targets, calls for and adjusts fire, and reports the

results of fire. In combat or emergency situations when there is no

FAC present, the FO may function as the terminal controller for

CAS strikes. The FO team must perform the following tasks:

• Assist the commander in overall fire support planning and

coordination matters.

• Advise the commander on the employment of artillery. The FO

must know how much and what type of artillery and/or

ammunition is available. He should be prepared to advise on all

types of indirect fire support.
Table 1-2. Notional Artillery Forward Observer Team

Equipment.

Notional Equipment Number

High mobility multipurpose wheeled vehicle

(HMMWV)'

1

AN/PRC-1 19A Single-channel Ground and

Airborne Radio System (SINCGARS) radio

2

AN/GRA-39 set1 1

OH-254 antenna' 1

Digital message systemldata automated

communications terminal (DACT)

2

Precise lightweight Global Positioning System

(GPS) receiver (PLGR)

1

AN-PAQ 3 modular universal laser equipment

(MULE)'

1

AN/GVS-5 laser rangefinder 1

Battery commander (BC) scope 1

Binoculars 2

Compass 2

Night vision goggles (NVGs) AN/PVS-7B2 1

Legend:

'Optional. 2 night vision devices may be available.

• Plan artillery fires for the company. This includes normal and

quick fire planning. The plan is approved by the company

commander.

1-3
1-4

• Be familiar with standing operating procedures (SOPs) of the

supported and supporting unit, including fire support SOPs and

the company's combat SOP.

• Know the tactical situation, including the scheme of maneuver

or plan of defense, and the enemy situation.

• Maintain continuous observation of the zone. The zone of

observation is the zone of action of the supported unit or the

zone of fire of the parent battalion. The FO team must occupy

the best OP or position permitted by the tactical situation.

• Determine and refine target locations, engagement criteria, and

trigger points as required.

• Make a terrain sketch of the area, whenever possible, to

improve accuracy and speed in locating targets. When setting

into a defensive position, the P0 should construct a visibility

diagram to pinpoint those areas where targets could remain

unseen from his vantage point. See appendix E for construction

of a visibility diagram.

• Report all target and intelligence information by using the size,

activity, location, unit, time, and equipment (SALUTE) format

and report actions of enemy aircraft and conduct crater analysis.

• Ensure constant communications with the battery or battalion

fire direction center (FDC) and the liaison officer (LNO) in the

battalion fire support coordination center (FSCC).
• Keep the FDC and artillery LNO at the battalion FSCC

informed of the tactical situation, the plans, and the location of

the supported unit.

• Maintain the FO team location to within 100 meters (six-place

grid) at all times. Periodic position reports (POSREPs),

coordinated with the reporting of the company commander,

should be made to the LNO. In the absence of a unit SOP or

special instructions, a rule of thumb for reporting position

changes is every 500 meters on foot or every 2 to 5,000 meters

in a fast-moving operation.

• Provide security for the team through the proper use of cover,

concealment, observation, and fire.

• Conduct regular preventive maintenance of all equipment

belonging to the FO team.

• Observe and direct other types of fire support when necessary,

for example, mortars, NGF, and CAS.

• Assist in training Marines with nonsupporting arms MOSs to

request fire support, if required.

1102. Communications. The artillery FO must maintain effective

communications to perform his mission. He has several means

available.

a. Radio. The FO team uses radio traffic as its primary means of

communication. All members of the team must be communications

1-5
1-6

experts; they must maintain the gear to the highest degree of

performance, troubleshoot, and enhance performance when

possible through the use of directional antennas and so on. The

following nets are employed by the FO team.

(1) Artillery Conduct of Fire Net (Very High Frequency). This

net provides a means for observers to request and adjust artillery

fire. The artillery LNOs at battalion FSCCs monitor/receive traffic

on the net for,fire support coordination purposes. FOs and LNOs

may use the net to plan and coordinate fires. If conducting

battalion-directed operations, the battalion establishes as many as

three conduct of fire (COF) nets and acts as net control on each.

The artillery battalion may identify a COF net for each maneuver

battalion to facilitate continuity of fire support during battery

displacements. The maneuver battalion (LNOs, FOs) remains on

the assigned COF net, and the artillery battalion FDC receives all

calls for fire. It then designates which firing battery, or batteries,

will provide fire support to the maneuver battalion. This allows the

artillery battalion to quickly mass on larger targets, as well as

manage the assets of the battalion as a whole. If conducting

autonomous operations, each battery FDC maintains a COF net

and acts as net control; each net is monitored by the battalion FDC

when present. Autonomous operations are also conducted by

batteries attached to a battalion landing team (BLT). The artillery

LNO at the battalion FSCC monitors all traffic on this net for

coordination purposes. The artillery LNO at the infantry regiment

may enter the net, as required. The stations on this net include the

following:
• Direct support artillery battalion headquarters

• Firing battery

• Artillery LNO at battalion FSCC

• FOs

• Artillery LNO at regimental FSCC, as required

• Reinforcing artillery units, as required.

(2) Division/Ground Combat Element Artillery Air Spot Net

(Very High Frequency). The artillery regiment (battalion when

operating independently) establishes this net for aerial observers to

adjust artillery fire. The artillery regiment is net control; however,

for a specific mission, control may be passed to the battalion or

battery FDC conducting the mission. When this net is in use, the

LNO monitors for targets in his unit's zone. The FO may use this

net to coordinate with an aerial observer for the attack of targets in

his company's zone of action. The stations on this net include the

following:

• Artillery regiment (net control) (For specific missions, control

may be passed to the FDC conducting the mission (battalion or

battery).)

• Aerial observer

• Artillery battalion, as required

1-7
1-8

• Firing battery, as required

• FOs, as required

• FSCCs, as required.

(3) Maneuver Tactical (Company Tactical) Net (Very High Frequency). Monitoring maneuver tactical nets is not a

requirement for the FO team. However, the ability to monitor

multiple channels with the PRC-1 19 enables the FO team to use

company nets to increase situational awareness without requiring

additional radios.

b. Automated Systems. Handheld devices, such as the digital

message system or DACT, enable users to rapidly prepare,

transmit, and receive both text and graphic messages over radios or

field wire. Automated systems use a burst transmission capability,

which minimizes vulnerability to enemy radio direction finding. It

is used by the FO to transmit calls for fire, fire plans, and

battlespace information. The DACT is currently being fielded, and

fire support software is under development. When using automated

systems, the FSCC establishes a mode of operation, which

determines the routing of calls for fire through the FSCC. In

FSCC-approval mode, the call for fire is sent to the FSCC for

clearance then forwarded to the supporting arm. In centralized

mode, the request goes to the appropriate artillery FDC first. One

or more COF nets should be dedicated to data communications.

Note that the artillery battalion still organizes itself to receive

missions by using battalion-directed and autonomous operations.
c. Wire. The FO uses wire communications to the extent permitted

by the tactical situation, time, and personnel available. In a static

defensive posture, a land line may be used between the company

commander and a remote OP. Wire may be used between the FO

and his fire support man when operating separately.

d. Messenger. The FO uses this method of communication

frequently when tactical situations permit. This method is a more

secure method of sending fire plans than other means. It reduces

radio traffic, thereby hampering enemy direction finding.

Section II. 81-mm Mortar Forward Observer

Two FOs are included in each of the two sections of the 81-mm

mortar platoon that is organic to the weapons company of the

infantry battalion. The infantry battalion commander may employ

the mortar platoon by section or as a platoon. The mortar FOs are

normally employed with the rifle companies. The mortar FO

carries his own radio.

1201. Responsibilities. The primary responsibility of the mortar

FO is to locate targets and call for and adjust mortar fire. He

performs basically the same duties as the artillery FO. The mortar

FO coordinates and plans the use of the mortars for the supported

company. The operations of the mortar FOs are coordinated by the

mortar platoon commander. A mortar representative is normally

positioned in the battalion FSCC to coordinate and advise on

matters concerning mortars.

1-9
1-10

1202. Communications. The infantry battalion mortar net (very

high frequency (VHF)) provides the means for requesting,

adjusting, controlling, and coordinating the fires of the 81-mm

mortar platoon. Stations on this net include the FO(s), the 81-mm

mortar section FDC (platoon FDC when employed as a platoon),

the 81-mm mortar representative in the battalion FSCC, and the

mortar platoon commander (net control).

Section III. Naval Gunfire Spot Team

The NGF spot team is one element of the shore fire control party

(SFCP); the other is a liaison team. The artillery battalion employs

its two organic SFCPs in support of the assault battalions in an

amphibious assault. The NGF spot team is normally provided to a

maneuver company; however, it may operate from a battalion OP.

The NGF spotter, a Marine lieutenant, is the company's expert on

all matters concerning NGF support. Like the artillery FO team, its

composition may be tailored to the needs of the supported unit.

(See table 1-3 and table 1-4 on page 1-1 1 for the organization of

the spot team and a list of notional equipment.)

Table 1-3. Naval Gunfire Spot Team Personnel.

Position/Rank/MOS Number

NGF spotter/IieutenantlO845 1 SFCP rnan!'orporal/O861 1 SFCP man/private - lance corporal/0861 1 Radio operator/private - corporal/2531 2
Table 1-4. Naval Gunfire Spot Team Notional Equipment.

Notional Equipment Number

AN/PRC-104 radio 1 AN/PRC-119 radio 1 MULE2 1 Laser AN/GVS-5 1 NVGs AN/PVS-7B3 2

Binoculars 3

Compass 3

Legend:

Includes KY-99 when NGF spot net is covered.

2Optional.

night vision devices may be used.

1301. Responsibilities. The primary responsibility of the NGF

spotter is to locate targets and call for and adjust NGF. The

operation of the spot team is coordinated by the naval gunfire

liaison officer (NGLO) in the battalion FSCC, assisted by the

artillery S-3, as required. The NGF spotter performs other duties

and operations similar to those of the artillery FO. The NGF

spotter also performs the following tasks:

• Plans NGF to assist the company in accomplishing its mission

• Keeps the NGLO in the battalion FSCC informed of the

company's tactical situation and the spot team disposition

(Periodic POSREPs are provided to the NGLO and the ship.)

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1-12

• Establishes and makes frequent contact with the other observers

(artillery and mortar FOs) and the FAC supporting the company

• Remains abreast of what types of ship(s) and ammunition are

available.

1302. Communications. The NGF spotter must have effective

communications to accomplish his mission. He must understand

the functioning of high frequency (HF) radio communications. The

NGF spot team communicates by the following means.

a. Radio. The following nets are established.

(1) Naval Gunfire Ground Spot Net (Primary High

Frequency/Secondary Very High Frequency). This net provides

a means for requesting and adjusting NGF and for passing vital

information between stations. Stations on this net include the

NGLO in the battalion FSCC, the spotter, and the direct support

ship. The NGLO, normally net control, monitors all traffic for

purposes of coordination. One frequency is normally allocated to

each battalion assigned a direct support ship. A general support

ship assigned to support the battalion will enter the NGF ground

spot net for the duration of the mission(s). The NGLO at the

infantry regiment may monitor the net, as required.

(2) Shore Fire Control Party Local Net (Very High Frequency).

This net provides direct communications between the NGF spot

team and the NGLO in the battalion FSCC. It provides a means for

coordinating the employment of the spot team and for coordinating
NGF matters. The net is also used for communication between the

NGF spotter and his spot team when separated. The NGLO

exercises net control.

(3) Naval Gunfire Air Spot Net (Ultra High Frequency/Very

High Frequency (Depends on Aircraft)). This net is used by an

aerial observer to request and adjust NGF. Stations on this net

include any aerial observers and the supporting ship. The NGLO at

the infantry battalion, regiment, and division enters this net. When

an aerial observer is working in conjunction with ground units, the

appropriate fire coordination agency will exercise net control. The

supporting arms coordination center (SACC) is net control before

transfer of control and coordination responsibilities ashore.

b. Wire. The spotter, like the artillery FO, has limited

opportunities to use wire communications. When permitted by the

situation, a land line is established between the NGF spotter and

his SFCP men when operating separately and/or between the

spotter's OP and the NGLO.

Section IV. Forward Air Control Party

The FACP is a terminal control agency subordinate to the tactical

air control party (TACP)., The TACP is the "subordinate

operational component of a tactical air control system designed to

provide air liaison to land forces and for the control of aircraft."

(Joint Pub 1-02, DOD Dictionary of Military and Associated

Terms) TACPs are integral elements of the Marine Air Command

1-13
1-14

and Control System (MACCS) and are organic to infantry

regiments and infantry, light armored reconnaissance (LAR), and

tank battalions. Infantry and LAR battalion TACPs consist of an

air party (air officer and communicators) and two FACPs that are

typically attached to companies consistent with the commander's

planned employment of aviation. The FACP is led by a FAC, who

is "an officer (aviator/pilot) member of the tactical air control party

who, from a forward ground or airborne position, controls aircraft

in close air support of ground troops." (Joint Pub 1-02) Naval

aviators or naval flight officers serving as FACs are formally

trained to provide terminal control and are officially designated as

FACs by MOS. (See Marine Corps Warfighting Publication

(MCWP) 3-23.1, Close Air Support). In addition to the FAC, each

FACP has four enlisted radio operators. Regimental TACPs do not

have FACPs. The tank battalion TACP includes two FACs but not

the radio operators of the FACP.

1401. Responsibilities. Although not part of the aviation combat

element (ACE), the FAC is an essential MACCS element. FACs

are the primary terminal controllers of aircraft providing direct air

support to task-organized maneuver elements. The FAC maintains

radio communications with assigned support aircraft from a

forward ground position. From this position, the FAC directs each

CAS aircraft in its run on the target. This control aids target

identification and enhances troop safety. The FAC may employ a

laser system for designating targets. The primary duties of the FAC

are as follows:
• Control aircraft during the terminal phase of CAS missions to

assist in target identification and minimize the danger to

friendly troops.

• Operate with the assault units of the battalion.

• Observe and locate targets of opportunity.

• Direct airstrikes against targets.

• Advise the supported company commander on the proper

employment of aircraft assets.

• Gather and report all information of an intelligence nature,

including target damage assessments.

• Stay abreast of the supported unit's plans, position, and needs.

• Stay abreast of the enemy situation, location of friendly units,

and current target list.

• Request and control aircraft in accordance with the MAGTF air

employment plan.

1402. Communications. The FAC maintains communications

with the air officer located in the battalion FSCC and with the air

control agency. He establishes and maintains positive

communications with assigned support aircraft from his forward

position. The FACP communicates by the following means.

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1-16

a. Radio. The following nets are used.

(1) Tactical Air Request Net (High Frequency). This net

provides a means for units to request immediate air support from

an air control agency. The FSCC at each echelon monitors this net

and coordinates with the air control agency to approve, deny, or

modify the requests. Target damage assessments and emergency

helicopter requests may also be passed over this net. Preplanned air

support requests may, if necessary, be passed over the tactical air

request (TAR) net if other means are not available. The stations on

this net include FACPs; the direct air support center (DASC);

FSCCs; the Navy tactical air control center (TACC); tactical air

coordinators (airborne) (TAC(A)s), FACs (airborne) (FAC(A)s), or

other terminal controllers; assault support coordinators (airborne)

(ASC(A)s); and other MAGTF agencies, as required.

(2) Tactical Air Direction Net (Primary Ultrahigh

Frequency/Secondary Very High Frequency (Depends on

Aircraft)). This net provides a means for directing aircraft in CAS

missions by the terminal controller (e.g., FAC) and for the air

control agency to brief support aircraft on target information and

handoff to the terminal controller or TAC(A).

(3) TacticaL Air Control Party Local Net (Very High

Frequency). This net provides a means for coordination between

the air officer in the battalion FSCC and the FACPs.

b. Related Aviation Nets. The FAC may function on the

following nets, when required.
(1) Helicopter Request Net (High Frequency/Very High Frequency). This net provides a means for TACPs of

helicopterborne forces to request immediate helicopter support

from the DASC or the helicopter direction center (HDC).

(2) Helicopter Direction Net (Ultrahigh Frequency/Very High

FrequencyfHigh Frequency). This net provides positive control

of inbound and outbound helicopters in the amphibious objective

area (AOA).

c. Other Means. The FAC may require other means of

communications. Other radio nets, existing land lines, or other

means may be used.

Section V. Employing Supporting Arms Observers, Spotters,

and Controllers

The employment of observers, spotters, and controllers is

coordinated by the artillery LNO, NGLO, air officer, and 81-mm

mortar representative at the supported-battalion FSCC. The

artillery battalion S-3 may assist in this coordination, as required.

During operations, supporting arms personnel should remain close

to the company commander to provide assistance as needed,

mainly because the commander receives reports from all elements

of his unit and must decide where fire support is most urgently

needed. If they must be separated from the commander,

communications must be established between them. The FO and

NGF spotter are assisted in their duties by fire support men. The

1-17
1-18

fire support men can locate targets and call' for and adjust fire.

They also assist in fire planning. The fire support men can be

collocated with the FO/NGF spotter during operations or located

with a forward element or OP.

1501. Offensive Operations. In offensive operations, supporting

arms personnel should be in position to maintain contact with the

company commander and to see the battlespace. Depending on the

nature of the mission and the situation, specific supporting arms

personnel (i.e., FO, FAC, or NGF spotter) may need to be

collocated with the commander to maintain voice contact; because

not all companies will have a FAC or NGF spotter, this may often

be the FO. Fire support men from the FO team and/or NGF spot

team may be located with the company's lead elements. In a

mechanized unit, a designated individual (such as the FO) may be

assigned a position on the commander's vehicle (tank or assault

amphibious vehicle (personnel variant) (AAV(P))) from which he

can operate (e.g., the loader's position on a tank). Fire support men

may be similarly positioned with the lead platoon. Supporting arms

personnel assist the supported unit commander in the offense by

doing the following:

• Planning fires to support the company's attack and its

reorganization following seizure of the objective (Fires are

planned on confirmed and suspected enemy positions and key

terrain. See MCWP 3-16, Fire Support Coordination, for

detailed discussion on planning fires.)

• Executing the fire support plan
• Calling fire on targets of opportunity designated by the

commander

• Providing battlespace in.fonnation regarding the enemy situation

• Providing additional channels of communication

• Aiding in land navigation.

a. Movement to Contact. During these operations, supporting

arms personnel perform the following tasks:

• Plan fires on critical points along the route of march

• Maintain their orientation by using land navigation skills and

terrain features for reference points identifiable on the ground

and on the map

• Conduct immediate action drills on contact

• Maintain continuous communications and provide periodic

POSREPs to the FDC, LNOs, air officers, and other observers,

as required, during movement.

b. Attack, Exploitation, and Pursuit. When enemy contact has

been made, supporting arms personnel position themselves where

they can best observe the actions of the supported unit, conduct fire

missions, and coordinate fires for the company commander. The

fire support men may be positioned on a terrain feature that offers

good observation of the company's advance. The company

commander is responsible for the fires of his company, including

1-19
1-20

fire support. He either directs which targets to attack with fire

support or approves missions. Supporting arms personnel must

meet the following requirements:

• Be familiar with immediate action drills on contact (via SOP,

operation order (OPORD), or situational reporting)

• Ensure that fires support maneuvering elements, that is, enable

elements to close with and destroy or bypass the enemy

• Assess the benefit of fires versus their risk to friendly forces, for

example, suppression versus minimum safe distance

• Consider the effects of shelllfuze combinations, for example,

improved conventional munitions (1CM)

• Incorporate movement of elements into the delivery time of

fires.

c. Consolidation. During consolidation on the objective,

supporting arms personnel perform the following tasks:

• Send reports to the FDC, air officer, and LNOs, for example,

situation reports (SITREPs) and new POSREPs

• Establish defensive fires and fires to disrupt an enemy

counterattack in the fire plan

• Continue fire planning and make revisions/changes as necessary

for the tactical situation
• Maintain continuous observation and fire support.

1502. Defensive Operations. Supporting arms personnel plan their

fires to support the company's plan of defense. Artillery, mortar,

NGF, and air fires are planned to break up the attack, repel the

assault, limit or destroy penetrations, and support counterattacks.

In the defense, supporting anns personnel perform the following

tasks:

• Plan fires forward of, on, and behind the supported unit's

defensive positions, including fires on obstacles and avenues of

approach

• Plan final protective fires (FPFs) (artillery and mortars) and

make adjustments if the situation permits

• Select an OP that provides good visibility of the company's area

of responsibility (Fire support men may be positioned with the

FO or NGF spotter, a platoon, or forward element.)

• Execute the fire plan, including battalion targets in the area of

responsibility

• Construct a visibility diagram of the company's area of

responsibility (artillery P0). (The diagram is prepared in

duplicate; one copy is retained by the P0, and the other is

forwarded through the artillery LNO to the battalion S-2. At the

battalion level, coverage is planned for those areas not under

ground observation. See appendix E.)

1-21
1-22

1503. Patrols. Providing fire support for friendly patrols is an

important flmction for supporting arms personnel, particularly the

artillery and mortar FOs. The FOs, FACs, and NGF spotters keep

LNOs, air officers, and the FDC informed of friendly patrol plans.

The FOs, FACs, and spotters may accompany the company

commander on a patrol when the patrol consists of the major

portion of the unit. Fire support men are normally positioned with

the remainder of the company during their principal's absence. Fire

support men may accompany a platoon or smaller sized patrol.

Supporting arms for the patrol are coordinated before the patrol

begins. The planning by fire support personnel should include the

following actions:

• Obtain from the company commander, along with the patrol

leader, the size of the patrol, times of departure and return,

mission, routes and checkpoints, and any special instructions.

• Assist the patrol leader in fire planning, following the guidance

provided by the company commander. Fires are planned along

the route on critical areas or key terrain by using priority targets

when available.

• Process the fire plan. Provide a copy to the patrol leader. Obtain

from the patrol leader any special communications instructions

or signals to be used.

• Make arrangements to maintain communications, as required.

1504. Retrograde Operations. Selected supporting arms

personnel (FO, FAC, or NGF spotter, depending on the situation)
remain with the company commander throughout retrograde

operations. The remainder of the teams displace with the

withdrawing forces to maintain continuity of observation and fire.

Fire support men may be employed in an overwatch position.

Supporting arms personnel must perform the following tasks:

• Plan fires for the period during which the company has control

of fires.

• Acquire and pass control of fires through the LNOs and air

officer.

• Maintain observation of the area of responsibility during control

of fires.

• Maintain orientation during movement.

(reverse blank)

1-23

Chapter 2

Target Location

Section I. Elements and Tools of Target Location

The observer's capability to provide the company with effective

fire support depends largely on his ability to locate targets quickly

and accurately. The elements of target location consist of direction,

distance, and altitude. Terrain/map analysis is key to accurate

target location. Because terrain/map analysis is applicable to the

artillery/mortar FO, the NGF spotter, the FAC, and other terminal

controllers, the use of the word observer in this chapter will apply

to all of them.

2101. Map Reading. Understanding and applying the skills of

map reading are essential to an observer's success. The observer

will need these skills to perform terrainlmap analysis. The

observer's map is second in importance only to his radio. He uses

his map 'to determine what terrain he expects to see in the

battlespace. The observer continually scans the map and terrain and

attempts to associate features that he sees on the ground with those

on the map. The observer uses the map to determine the location of

targets, friendly positions, and his own position and to keep

oriented during movement. By using his map and other tools, he

determines direction, distance, and altitude for target location. For

a good terrain/map analysis, the observer performs the following

tasks:

2-1
2-2

• Locates himself within 100 meters of his actual location on the

ground each time he moves

• Uses prominent terrain features to relate potential target areas to

grid locations on the map

• Makes a thorough study of terrain by drawing a terrain sketch

• Associates the direction in which he is looking with a direction

on the map and incorporates the map's marginal information in

orienting direction-determining tools.

2102. Direction. Direction is the most important element of target

location and an integral part of terrain/map association and

adjustment of fire. Direction is a term used by an observer to

indicate the bearing of the spotting line.

a. Units of Measurement. Direction can be measured in mils or

degrees. Degrees can be converted to mils when required.

(1) Mils. A mil is a unit of horizontal clockwise angular

measurement that is equal to 1/6,400 of a circle. The mu is

normally used because of its accuracy and the mil relation

formula's ability to easily convert angular deviation into distance.

Mils may be measured from the map (grid north) or by using a

compass (magnetic north). The standard unit of measurement is

mils grid and need not be specified in the call for fire. Other units

of measurement must be specified.
Example

"Direction 1600." (Understood to be mils grid.)

"Direction 1600 mils magnetic." (Unit of measurement must be specified if

different from the standard.)

(2) Degree(s). A degree is a unit of horizontal clockwise angular

measurement that is equal to 1/360 of a circle. Degrees can be

measured from grid, magnetic, or true north. When the observer

uses degrees in the call for fire, he must specify the type.

Example

"Direction 090 degrees magnetic."

(3) Conversion of Degrees to Mils. Degrees may be converted to

mils by multiplying the number of degrees by 17.8.

Example

90 degrees x 17.8 = 1,602 mils

b. Types of Direction. There are several types of direction that can

be used by the observer—an observer-target line (OTL), a

gun-target line (GTL), cardinal or intercardinal directions, and an

arbitrary reference feature.

(1) Observer-Target Line. The OTL is "an imaginary straight line

from the observer/spotter to the target." (Joint Pub 1-02) It is the

most commonly used direction for locating targets and conducting

2-3
2-4

adjustments. The standard unit of measurement is mils grid.

Observer-target (OT) direction is determined as accurately as

possible and transmitted to the nearest 10 mils (or nearest degree).

Example

A direction of 0642 mils would be transmitted as direction 0640" (mils grid

understood).

(2) Gun-Target Line. The GTL is "an imaginary straight line from

the gun(s) to the target." (Joint Pub 1-02) GTL is frequently used

by aerial observers as a spotting line for adjustments of fire. It can

also be used by ground observers, particularly when positioned on

or near the GTL. When the GTL is used as a direction, the standard

unit of measurement is mils grid. If the observer desires to use the Gil as a spotting line, he transmits "direction gun-target line" in

the call for fire.

(3) Cardinal or Intercardinal Directions. This involves the use

of one of the eight cardinal/intercardinal directions (north,

northeast, east, southeast, south, southwest, west, northwest). It is

often used by aerial observers. It can also be used by ground

observers, but the accuracy in adjustment is reduced. (See figure

2-1 on page 2-5.)

Example

"Direction northeast."
(4) Arbitrary Reference Feature. The observer may use a natural

or manmade feature (such as north-south river or road) from which

reference is made in target location and/or adjustment of fire. This

type of direction may be used by aerial observers. It may also be

used in situations in which the transmission of the OTL may

compromise the ground observer's location. The observer may use

an arbitrary feature to adjust fire.

Example

'Direction north-south road.

c. Determining Direction. There are four methods for determining

direction.

2-5

0°or 360°

0 or 6.400 miIs

315°or 5,600 mils

270°or 4800 miis or 1,600 mils

225or 4,000 mils

180°or 3,200 mils

Figure 2-1. Cardinal Direction.
2-6

(1) Using a Measuring Device. An observer can measure direction

by using a compass or an instrument that has been oriented for

direction, such as a MULE, BC scope, or aiming circle. (See

paragraph 2106.)

(a) Lensatic or M2 Compass. The lensatic compass has an

accuracy of only +1- 50 mils. The M2 compass must be declinated

but provides readings to an accuracy of +1- 10 mils.

(b) Modular Universal Laser Equipment. The MULE has a

north-finding module to determine direction to an accuracy of +1- 2

mils. Direction can then be read to the nearest mu. Advanced

procedures can be used to orient the MULE for direction when the

north-finding module is nonfunctional. A detailed discussion on

the use of the MULE is contained in chapter 9.

(c) Battery Commander Scope. A BC scope, or aiming circle that

has been oriented for direction, provides readings to one mu. The

accuracy depends on the means of orientation.

(2) Measuring From a Reference Point. Direction can be

determined by using a reference point with a known direction. By

determining the angular deviation in mils between the reference

point and the target, a direction can be computed by applying the

deviation to the known direction. (See figure 2-2 on page 2-9.) Add

the mils to the known direction if the target is to the right of the

reference point; subtract if the target is to the left (right add, left

subtract (RALS)). Angular deviation can be determined by using

any instrument with a reticle pattern or by hand measurement. (See
paragraph 2103.) It is measured to an accuracy of one mu when

using a reticle pattern (MULE/BC scope/aiming circle), five mils

for handheld binoculars or AN/GVS-5, or 10 mils by hand.

(3) Scaling From a Map. The observer may scale direction from a

map to an accuracy of 10 mils by using a protractor.

(4) Estimating. Estimating on the ground is the least accurate

method, but it can be used when the observer requires speed or is

separated from his map and compass. The observer should be able

to visualize a cardinaL/intercardinal direction, as depicted in figure

2-1, remembering that the sun and moon rise in the east and set in

the west.

2103. Determining Angular Deviation. The observer must be

able to determine angular deviation or measurement. In addition to

using angular deviation or measurement to determine direction, he

uses it for determining horizontal and vertical distances to target

location and in determining corrections in adjustment. The

observer can determine angular deviation or measurement by use

of the following.

a. Reticle Patterns. Reticle patterns are found on optical

instruments and are the primary means of measuring angular

deviation. Binoculars and AN/GVS-5s can measure angular

deviation to an accuracy of +1- 5 mils. MULEs, BC scopes, and

aiming circles can all measure angular deviation to an accuracy of

+1- 1 mil. Any object within the field of view with a known

direction can serve as a reference point. Binoculars are the most

2-7
2-8

common tool for measuring horizontal and vertical angles. (See

figure 2-2 and paragraph 2106.) When operating in a static

situation, the observer can more accurately determine angular

deviation by using the reticle pattern on a MULE, BC scope, or

aiming circle. These instruments provide a stable platform and are

extremely useful when accurate measurements are paramount, for

example, for precision missions, for measuring vertical angles, and

for night observation. When oriented, they provide accurate

direction. When not oriented, the reticle pattern can still be used to

measure angular deviation to an accuracy of +1- 1 mu.

b. Hand Measurement of Angles. The observer may use his hand

and fingers for angular deviation or measurement in situations

where speed is essential or when he has no other means. The

observer fully extends his arm with the palm of his hand pointed

toward the target area or reference point. By using the values

contained in figure 2-3 on page 2-10, the observer can determine

an approximate angular deviation or measurement. To increase his

accuracy, the observer should determine the actual values of his

hand and finger measurements. He does this by comparing a

known deviation between two objects with that derived from his

hand/fingers.

c. Measurement of Angles With Objects. The observer may also

use common objects to measure angles as shown in figure 2-4 on

page 2-10. Without more accurate means available and knowing

the actual size of potential targets and the measurements shown in

figure 2-4, the observer can quickly determine range with

reasonable accuracy. (See figure 2-5 on page 2-11.)
IItIiitI•IiIIiIsII6I4II

60 I1

60

LOW 9*11 #AMGE ETERS MULl 100001 AWGVS.3 RM*ci.Pattsrn

larget s40 mfls Ie1 o(

rejorence pOlflt.

Figure 2-2. Measuring Angular Deviation.

2-9

PtOrrecOon 2100 I -\
2-10

Figure 2-3. Hand Measurement of Angular Deviation.

Figure 2-4. Angular Measurement of Common Objects.

300 180 125

Numb.?,

Reprasint MIII

By k5Ong the mu value at anna

length Dl oulous coons of equipment

and the eQual eiZe of targets, you

I Carl determine range rather quickly *dtfl a reasonable degree of acaracy.
xampe

At arm's length, the hole in your dog tag is

approximately 7 mils. An enemy tank is

approximately 7 meters long. If you can

see the entire tank inside the dog tag hole,

R W 7m

2104. Distance. Distance is the second element of target location.

Once the direction has been determined, the observer must

determine distance to the target. Distance is the horizontal space

between a reference point or a ground observer and a target.

Distance is normally the most difficult variable to determine in

target location. It is also used in adjustment of fire, for example,

OT factor. (See chapter 3, section III.) The meter is the standard

unit of measurement for distance. Other units of measurement may

2-11

— The range is greater

than 1,000 meters.

Figure 2-5. Determining Range With Common Objects.
2-12

be used if specified in the call for fire. Distance can be determined

by one of the following methods.

a. By Measuring Distance (Laser Rangefinder). The MULE or

the AN/GVS-5 provides the quickest, most accurate means of

determining distance. When battery operated, its usage should be

conserved. (See paragraph 9003.) The MULE and AN/GVS-5

measure distances to an accuracy of +1- 10 meters.

b. By Sound

(1) Sound Ranging: Flash-to-Bang Method. To determine

distance by using the flash-to-bang method, count the number of

seconds between a round detonation (flash) and the sound of the

impact (bang), and multiply this time by the speed of sound (350

meters/second).

Formula

Flash to bang (sec) x 350 = distance (m)

This method has several uses to the observer; for example, it

allows the observer to confirm distances. By using the

flash-to-bang distance to a round impacting in the battlespace, the

observer can associate this distance on the ground with a future

target. For example, if the flash-to-bang distance is 4,000 meters

and the observer sees a target between himself and the previous

point of impact used in the flash-to-bang method, he knows that

the target must be closer than 4,000 meters. Similarly, the

flash-to-bang method can be used to verify the OT factor during
adjustment. The method can also be used to determine the distance to

the muzzle flash of an enemy weapon. When combined with a

good direction, the observer can achieve accurate target location data.

(2) Audible Sounds. There will be occasions when the observer

will not be able to see the flash of a weapon or a round detonation.

To estimate distance in these situations, the observer can use

common sounds. Table 2-1 provides frequently heard noises with

estimated distances.

Table 2-1. Audibility of Various Actions.

Maximum Distance (m) Sound

100 - 200 Human speech

300 Stakes being pounded into the ground by hand

500 Stakes being pounded into the ground

mechanically

500 - 1,000 Trenches being dug (shovel striking rocks or iron)

800 Tree cutting, tree falling

1,000 - 2,000 Automatic fire

3,000 Single rifle shot

c. By Estimating Distance. The observer must estimate the

distance if a more accurate method is not available. The degree of

accuracy depends on several factors, such as terrain relief, time

available, and experience of the observer. Generally, the longer the

observer remains stationary, the better he can use this method.

2-13
2-14

(1) Mental Estimation. A mental distance estimate is made by use

of a known unit of measurement. Distance is estimated to the

nearest 100 meters by determining the number of known units of

measurement between the observer's position and a target. For

example, a football field, which is 100 yards long, can be used as a

known unit of measurement for determining the distance between

an observer's position and a target. For longer distances, it may be

required to progressively estimate distance. To do this, the

observer determines the number of units of measurement to an

intermediate point and doubles the value. The observer should

consider the effects in table 2-2 to estimate distances.

Table 2-2. Considerations in Mental Estimation of Distances.

Conditions in Which Objects Appear

Nearer

Conditions in Which Objects

Appear More Distant

In bright tight In poor light or in fog

In clear air at high altitude When only a small part of the object

can be seen

When the background is in contrast

with the color of the object

When the background is similar in

color to that of the object

When the observer is looking down

from a height

When the observer is looking over a

depression, most of which is visible

When the observer is looking over a

depression, most of which is hidden

When the observer is kneeling or

sitting, especially on a hot day, when

the ground is moist

When the observer is looking down a

straight feature such as a road

When the observer is looking over

water, snow, or a uniform surface such

as a cultivated field or desert
(2) Estimating When Visibility Is Good. When visibility is good,

distances can be estimated by using the appearance of tree trunks,

their branches, and foliage (as seen by the naked eye) in

comparison with map data. Table 2-3 can be used as a guide for

wooded terrain. Numerous other objects may be used to estimate

distances as well. Table 2-4 on page 2-16 can be used as a guide

for urban environments.

Table 2-3. Use of Trees and Foliage for Estimating Distance.

Distance (m) Tree Description

1,000 Trunk and main branches are visible. Foliage appears in

cluster-like shape. Daylight may be seen through the foliage.

2,000 Trunk is visible, main branches are distinguishable, foliage

appears as smooth surface. Outlines of foliage of separate

trees are distinguishable.

3,000 Lower half of trunk is visible. Branches blend with foliage.

Foliage blends with adjoining trees.

4,000 Trunk and branches blend with foliage and appear as a

continuous cluster, smooth in appearance. Movement of

foliage caused by wind cannot be detected.

5,000

and

beyond

The whole area covered by trees appears smooth and dark.

(3) Estimating by Using Known Dimensions. Distance can be

estimated by using known dimensions of vehicles and the

mu-relation formula (W = R x 1ff). By using the width of a vehicle

appearing perpendicular to an observer as the lateral distance (W)

2-15
2-16

and measuring the width in mils (th), the distance can be

determined by solving the formula for range in thousands (R), or R

= W — Ift. This data, when compared with map data, will help an

observer to estimate distances. Dimensions of equipment can be

obtained from armored vehicle recognition cards (Graphic Training

Aid (GTA) 17-2-13), which can be obtained from the battalion S-2

or supply officer. The dimensions of selected equipment are

provided in table 2-5 on page 2-17.

Table 2-4. Use of Various Objects for Estimating Distance.

Distance (m) Object Identified by the Unaided Eye

1,000 Lone tree trunk

1,500 Individuals and horsemen

3,000 Chimneys on rooftops

4,000 Windows in houses

4,000 - 5,000 Individual houses in a populated area

8,000 9,000 Villages and individual houses

15,000 - 18,000 Large houses, towers, and steeples

(4) Estimating From a Terrain Study. The observer should

always use terrainlmap analysis to assist in estimating distances.

When the observer is looking in a specific direction, the estimation

of distance can be enhanced by studying the terrain to associate

what he is actually seeing on the ground with what he is seeing on

the map. The use of an observed fire (OF) fan helps the observer to
associate map and compass direction, maintain orientation for

direction, and refine distances. Particular emphasis should be given

to color contrasts of terrain features seen along the OTL. For

example, the distance across successive ridge lines or depressions

in the distance may be identifiable by only slight changes of color

to the eye. Different colors of grass might reveal a hidden terrain

feature such as a stream.

Table 2-5. Example of Estimating Distance by Using Known

Dimensions.

Equipment Dimensions (m)

Side View Front View

Tank (T-80) (chassis) 7.4 3.4

Tank (T-62) (chassis) 6.5 3.4

Reconnaissance vehicle

(BRDM-2)

5.7 2.4

Reconnaissance vehicle

(BTR-60)

7.5 2.8

Armored personnel carrier

(BMP)

6.8 2.9

A4r defense weapon

(ZSU-23-4)

6.3 2.9

2-17
2-18

Example

An observer sees an armored, personnel carrier (BMP). He measures its

width as seen from a side view as two mils.

Formula

By using the formula, he determines the distance: R=Wfflwhere:

= 2 mils (measured by binoculars)

W.= 6.8 m (known dimension of side view)

R = 3,400 m (6.8 ÷2 = 3.4)

2105. Altitude. The third element of target location is altitude.

Altitude is "the vertical distance of a level, a point or an object

considered as a point, measured from mean sea level." (Joint Pub

1-02) The meter is the standard unit of measurement for altitude.

There are three methods of measuring altitude:

• Map spot—if measured from a map spot, the altitude of a target

is determined by use of contour lines and the contour interval of

the map.

• Vertical shift—altitude may also be determined as a vertical

shift from the altitude of the observer's position or from a

known point to the target. (The vertical shift, given as an up or

down, uses the same principles of angular deviation and the mil

relation formula discussed in paragraph 2103. The M2 compass

clinometer can be used and is discussed in paragraph 2106.)
• Vertical angle—laser poiar missions specify the vertical angle

in mils. This allows the FDC to incorporate the vertical shift

with the associated distance for accurate target location.

Example

"Altitude 480," "up 50," and "vertical angle three."

2106. Tools To Assist the Observer. The following tools are

used by the observer in target location and terrain and map

analysis. These tools include the M2 compass, binoculars, BC

scope, GPS, OF fan, terrain sketch, and visibility diagram. Chapter

9 discusses AN/GVS-5 and MULE employment. The tools are

most effective when used together.

a. M2 Compass. The M2 compass is the most accurate compass

for determining direction (+1- 10 mils). It is a multipurpose

instrument used to obtain azimuth readings and vertical angles.

The magnetic needle (the white end of the needle) shows a

magnetic north. The magnetic needle reading is taken from the

black end when the bubble is centered in the circular level. The

azimuth scale adjuster assembly rotates the azimuth scale to

introduce the declination constant.

(1) Declinating the M2 Compass. The procedure for declinating

the M2 compass from a surveyed declination station free from

magnetic attractions is as follows:

2-19
2-20

• Set the M2 compass on a tripod over the orienting station, and

center the circular level.

• Sight on the known, surveyed azimuth marker.

• By using the azimuth adjuster scale, rotate the azimuth scale

until it indicates the same. as the known surveyed azimuth.

• Recheck sight picture and azimuth to the known point. Once the

sight picture is correct and the azimuth reading is the same as

the surveyed data, the M2 is decimated.

The procedure for field-expedient declination of the M2 compass is

as follows:

• By using the azimuth adjuster scale, set off the grid-magnetic

angle (shown on the bottom of all military maps).

• Once the grid-magnetic angle has been set off on the azimuth

scale, the M2 compass is declinated.

Note

Once decimated, the M2 compass measures gnd azimuths.

(2) Measuring Azimuths With the M2 Compass. The procedure

for measuring an azimuth follows:

• To read the azimuth scale by reflection, hold the compass in

both hands at eye level with arms braced against the body and
with the rear sight nearest your eyes. Place the cover at an angle

of approximately 45 degrees to the face of the compass so that

the scale reflection can be viewed in the mirror. (See figure

2-6.)

• Level the instrument by viewing the circular level in the mirror.

• Sight on the desired object, and read the azimuth indicated on

the reflected azimuth scale by the south-seeking (black) end of

the compass needle.

Figure 2-6. Measuring an Azimuth With the M2 Compass.

(3) Measuring Vertical Angles With the M2 Compass. The

procedure to measure a vertical angle with the M2 compass is as

follows:

2-21

Front Sight Rear Sight

Reflected Scale Image Rear Sight Holder
2-22

• Hold the compass on edge with both hands at eye level with

arms braced against the body and with the rear sight nearest

your eyes.

• Place the cover at approximately 45 degrees to the face of the

compass so that the elevation scale reflection can be seen in the

mirror. (See figure 2-7 on page 2-23.)

• Sight on the target or crest, and center the elevation scale

tubular level with the lever on the back of the compass and by

viewing the elevation scale in the mirror.

Read the elevation in mils on the elevation scale. Measure

again, and record the average.

Warning

The M2 compass must be employed free of magnetic attractions. Below are

the minimum distances that should be kept when using the compass to

measure a direction.

High-tension power lines: 55 m

Artillery, trucks, or tanks: 10 m

Telegraph, telephone, or barbed wire: 10 m

Crew-served weapons: 2 m

Rifle or radio: 0.5 m

b. Binoculars. In addition to measuring angular deviation,

binoculars enable observers to focus on distant objects. When

using binoculars, the following considerations apply:

• The binoculars must be held parallel to the deck and steadied

against the body or a prop.
• The observer should determine, memorize, and record his

interpupillary and depth settings to allow for quick adjustment.

• The protective plastic lens cap on the binoculars can be

removed to increase the field of vision for observers who wear

glasses.

• Masking tape can be used on the metal retaining ring to prevent

scratching the glasses.

The diopter adjustment ring canbe taped in the correct position

so that the observer does not have to adjust the diopter setting

every time he uses his binoculars.

2-23

Figure 2-7. Measuring the Vertical Angle.
2-24

c. Battery Commander Scope and Aiming Circle. Both the BC

scope and aiming circle provide a stable platform for observation.

When oriented for direction, they can measure direction to an

accuracy of +I- 1 mu (depending on the source of orientation).

The aiming circle can provide its own source of orientation with

its magnetic needle. Emplacement of the BC scope is the same as

for the aiming circle, which is referenced in MCWP 3-16.3/U.S.

Army Field Manual (FM) 6-50, Tactics, Techniques, and Procedures for the Field Artillery Cannon Battery. The

procedures for orienting for direction follow:

• Ensure that the instrument is leveled.

• Place the known azimuth on the upper (or recording) motion.

(The scale should show the known azimuth.)

• With the lower (nonrecording) motion, sight on the known

azimuth marker. (The scale should still show the known

azimuth.)

• Use only the upper motion to measure direction.

• Do not move the lower motion unless reorienting.

d. Global Positioning System. The GPS is a space-based

navigation system that provides worldwide, continuous,

all-weather, three-dimensional position information. The GPS

includes satellites and receivers. The current receiver is the

AN/PSN-1 1 PLGR. The PLGR can provide the observer with grid
location and navigational information. To use the PLGR, verify the

following.

(1) Cryptographic Keys. The proper cryptographic keys must be

loaded into the PLGR to enable it to use the precise positioning

system (PPS). The PPS must be used to achieve the necessary

accuracy and to avoid enemy electronic warfare measures. If the

cryptographic variable is not loaded, PLGR accuracy is lessened.

(2) Datum. The map datum should be the same as the operational

datum being used by all other maneuver, fire support, and target

acquisition units. If the same datum is not used, significant position

errors are possible.

(3) Coordinates. The universal transverse mercator (UTM)

coordinate format is preferred because it is the standard used by

survey and most fire control systems.

(4) Elevation. Mean sea level is the preferred selection because

most military maps use it as the basis for the elevation scale.

(5) Units of Measurement. Meters is the preferred selection

because most military maps refer to distance and elevation in

meters.

(6) Almanac Data. Almanac data must be one day old. If almanac

data are not one day old, satellite vehicle or timing errors not noted

by the PLGR are possible.

2-25
2-26

(7) Figure of Merit. Figure of merit (FOM) is an accuracy

estimation of the data displayed by the PLGR; it ranges from one

through nine. FOM 1 is the best accuracy estimation displayed by

the system, and FOM 9 is the worst. For observer positioning, only

coordinates determined with FOM 1 will be considered to be

accurate.

(8) Mode of Operation. The PLGR offers three choices—fix,

continuous, and averaging—as modes of operation. The averaging

mode yields the most accurate data and is preferred when

determining a position for indirect-fire weapon employment.

(9) Position. Position verification by a separate means to check for

gross errors should always be performed.

Warning Azimuth determined with the PLGR is for navigation only. The PLGR azimuth

is not accurate enough for use in establishing directional control and should

never be used for orienting observation devices. Tests show that

PLGR-determined azimuth may be in error by as much as 200 mils. Refer to

Technical Manual (TM) 11-5825-291-13, Operations and Maintenance

Manual for Satellite Signals Navigation Sets AN/PSN-1 1, for further

information.

The PLGR does not relieve the observer of his land navigation

responsibilities. He must be able to locate both himself and targets

without the aid of GPS for the following reasons:
• GPS receivers rely on electronic line of sight with the satellites.

The PLGR must be able to acquire at least four satellites so that

a three-dimensional position can be determined. Dense foliage,

buildings, mountains, and canyons will mask the GPS signal

and cause the receiver to fail.

• Multipath distortion (reflected signals) may occur if the

receiver's antenna is tilted away from a satellite. This causes a

reflected signal to be received that has more power than the

direct signal. Coordinates determined under these conditions

can be off by as much as several hundred meters.

• Electronic warfare can jam GPS signals for periods of time.

e. Observed Fire Fan. The OF fan is a transparent protractor that

can be used to refine distance on the map. (See figure 2-8 on page

2-28.) It is not used to determine direction. It helps the observer to

identify on the map what he sees on the ground. The OF fan has 17

radial lines that are 100 mils apart and cover a total area of 1,600

mils. The radial lines represent OT direction. The OT distance is

represented by arcs marked on the fan every 500 meters and

labeled every 1,000 meters, beginning at 1,000 meters and

extending to 6,500 meters.

Note

The OF fan is available in the supply system as GTA 6-7-3.

2-27
2-28

—-'-

V — 02

—04

;ci32

——ti: 4°ri

7-; X7

10 .

- - I

Observer I.— (. .

- D r(r-Jv iri—.c

3130

29

28

27

26

25

24

Figure 2-8. Target Location Using the Observed Fire Fan.

(1) Orienting the Observed Fire Fan on the Map. To prepare the

OF fan, perform the following steps:

• Place the vertex of the OF fan over the observer's location.

• Place the center radial in the direction of the center of the

observer's sector of observation.

/1

50 51 52 53 54 55 56 57 58 23

Note

The target is approximately 3,200 meters from the

observer in a direction of 0650 mils. The grid

location is approximately 531 269.
• Move the fan slightly until one of the radial lines is parallel to a

grid line. The direction of that radial line is the same as that of

the grid line. For example, a radial line parallel to a north-south

grid line, with the OF fan oriented generally north, would be

direction 6400 or 0.

• Attach the OF fan in position on the map by using a piece of

tape along one edge of the fan. The OF fan can then be lifted,

when required, without disturbing its orientation.

• With a marker pen or grease pencil, number the radial of known

direction, dropping the last two zeros (6400 would be 64). Then

label every second radial with the appropriate direction.

Remember that the radial lines are 100 mils apart. (Direction

increases to the right and decreases to the left.)

(2) Using the Observed Fire Fan. To determine target location,

the observer must first determine direction and distance by using a

method discussed previously. Then he plots the data on the OF fan

by finding a radial line corresponding to the OT direction. Visual

interpolation is required if the direction plots between two radials.

The observer follows the radial or interpolated radial until he has

scaled off the estimated distance. He compares the terrain near the

target with the terrain of his estimated point on the map. If they

agree, his target location is accurate. If they do not agree, he

searches along the radial line until he finds terrain that matches.

The target must be along the radial or interpolated radial line

representing the direction to the target. (See figure 2-8 for target

location using the OF fan.) When the observer is rapidly changing

positions, he can orient his fan over the next prominent terrain or

2-29
2-30

manmade feature that he will cross. He notes the direction to a

known point or feature in the target area. In this manner, he can

maintain the relative orientation of his OF fan to aid in determining

direction and target location.

f. Terrain Sketch. The terrain sketch is a rough panoramic

drawing by the observer of his area of observation. (See figure 2-9

on page 2-31.) The sketch is primarily used as a rapid means of

recording/identifying predetermined directions to reference points.

A properly constructed terrain sketch aids the observer in an

organized study of the terrain. A terrain sketch also provides a

rapid means of orienting relief personnel. The terrain sketch should

include the following:

• The skyline (horizon)

• Prominent objects or features such as draws, hill masses,

streams, wood lines, ridge line, roads, buildings, battlespace

debris, and so on

• Directions and distances to prominent objects or features, with

labeling of reference and known points.

g. Visibility Diagram. To locate targets and report battlespace

information effectively, the observer must be able to see within his

area of observation. However, as a result of terrain features, certain

areas will not be visible from the observer's location. A visibility

diagram will pinpoint those areas that cannot be seen by the

observer. The visibility diagram is a sketch that is drawn to scale

by the observer of the area of observation. (See figure 2-10 on page
2-32.) It shows those portions of the terrain that cannot be

observed from a given OP.

JA: JIL.L.IAmS

cE94

L.oCAi1oJ: 4a91

Figure 2-9. Terrain Sketch.

(1) Construction of the Visibility Diagram. The construction of

the visibility diagram requires a detailed study of the terrain. (For

steps in constructing the visibility diagram, see appendix E.) In

fast-moving operations, there may not be time to construct a

visibility diagram. In these cases, observers still need to locate

areas that they cannot observe. A possible alternative would be a

verbal report giving azimuths and distances to screening obstacles.

2-31
2-32

Another alternative would be to give a grid location and radius of

an area that cannot be observed. However, at the first opportunity,

the observer must construct a visibility diagram.

Figure 2-10. Visibility Diagram.

(2) Using the Visibility Diagram. The most important use of the

visibility diagram is to help coordinate the complete visual

coverage of the battlespace. Ideally, the visibility diagrams are

reviewed by the company commander and dispatched to the

infantry and artillery S-2 officers. The diagrams are used to

evaluate target area coverage so that gaps can be covered. They

also determine the best locations and orientations for other target

acquisition resources. Visibility diagrams are used to reduce errors

in reporting target locations. If a target plots in an area that is not

visible, the target location is obviously in error.

14

16
h. Radar Beacon. The radar beacon is "a receiver-transmitter

combination which sends out a coded signal when triggered by the

proper type of pulse, enabling determination of range and bearing

information by the interrogating station or aircraft." (Joint Pub

1-02) The radar beacon is a lightweight portable radar transponder

used to aid in the delivery of accurate NGF under all conditions of

visibility. The beacon provides an electronic reference point ashore

from which beacon-capable ships can fix their actual or relative

location. Use of the beacon can practically eliminate the navigation

error element from the initial salvo error. The types of beacons that

are currently in inventory are the ANIUPN-32 and the AN/PPN-19.

The AN/PPN-19 can also be used by aircraft. Currently, all U.S.

Navy ships with five-inch guns are capable of acquiring a beacon.

The beacon is normally emplaced by a small radar beacon team

(usually two or three men), which may be attached to the battalion

SFCP or to a reconnaissance unit. The beacon transmits 1 of 10

different electronic signals or codes; this signal or code is set in the

field by the beacon team for acquisition by the ship. If the radar

beacon is used, beacon data will be sent to ships via an operational

message, general (maritime tactical message), amphibious

(OPGEN MIKE) or via an operational tasking (maritime tactical

message), amphibious (OPTASK AMPHIB) message. When notified by an SFCP that the radar beacon will be used for a

mission, ship personnel will select the method to be used. After

acquiring the correct signal transmitted by the beacon, ship

personnel report to the SFCP "locked on and tracking beacon" and

await the call for fire. Ship personnel may use the beacon in one of

three methods.

2-33
2-34

(1) Method ALFA. This method may be used when the exact

location of the beacon is known (OPORD or beacon team

information). In this method, the beacon is used simply as a

navigation aid to determine the ship's position. Fire missions are

conducted in the normal manner discussed in subsequent chapters.

(2) Method ALFA Modified. This method may be used when the

exact location of the beacon is not accurately known and when

combat grid charts are not available. The observer gives target

location in polar coordinates or as a shift from the beacon position.

(See section II of this chapter for procedures for polar plot and shift

from a known point.) Ship personnel plot the beacon location, the

ship's relative position, and the target's position relative to the

beacon. The target is the point of aim and is engaged as a simple

indirect-fire mission.

(3) Method BRAVO. This method may be used whether or not

beacon location is accurately known. The observer locates the

target by using polar coordinates from the beacon position. The

beacon location is the point of aim, and offsets are introduced into

the computer to lay the gun on target. This method is normally the

fastest but does present a potentially unsafe condition. In the event

that the offsets do not register in the ship's gunfire control system,

the beacon team position will become the point of aim.
Section II. Methods of Target Location

Terrain/map analysis is essential in target location. The results of

this analysis (i.e., direction, distance, and altitude) provide the

basic data for determining a target's location. Knowledge of

information in section I of this chapter is essential to

accomplishing the various methods of target location. Because the

methods of target location apply to the artillery/mortar FO and the

NOF spotter, the word observer is applicable to both except where

separately addressed. The observer selects a method of target

location based on whether his position is known by the firing unit,

the availability of known/reference points in the battlespace, and

tools available for target location. Three methods of target location

exist: polar plot, grid coordinates, and shift from a known point.

Note

Regardless of the method of target location, map datum information is a

prerequisite to accuracy. The firing unit must know the spheroid or datum

(e.g., World Geodetic System 1984) and grid zone from the marginal

information on the observer's map before conducting missions.

2201. Polar Plot. In the polar plot method, the observer describes

the target location in relation to his position. The primary

advantage of the polar plot method is that it is fast and can be done

without a map. Laser rangefinders and oriented BC scopes greatly

enhance the accuracy of the polar plot. The primary disadvantage

of this method is the chance that the enemy may determine the

observer's position by intercepting the call for fire and computing

2-35
2-36

a back azimuth from the target. Another disadvantage is that the

observer's position must be known by the firing unit (battery,

mortar platoon, or ship). This may require the observer to transmit

his location and altitude before sending the call for fire. Figure

2-1 1 shows target location by the polar plot method.

Figure 2-11. Polar Plot Method of Target Location.

a. Steps for Determining Data. The steps to determine polar plot

data are listed below.

Direction 0370

Distance 3200

T-62 Tank With

Dismounted

Infantry

Estimated

Distance 3200

OP (Plotted By Firing Unit)

Note

The FO has determined that there is no obvious

altitude difference.
(1) Determine the OT direction to the nearest 10 mils. An oriented

BC scope will determine direction to the nearest mu.

(2) Determine or estimate the distance to the target to the nearest

100 meters. Laser data will be determined to the nearest 10 meters.

Distance will be transmitted in the call for fire as "distance"

followed by the distance to the target (meters understood).

(3) Determine the vertical difference between the observer and the

target. The vertical difference will be transmitted in the call for fire

as an "up" or "down" shift from the altitude of the observer to the

altitude of the target if the shift is 35 meters or more. Any vertical

shift that is determined will be transmitted to the nearest 5 meters

(or 20 feet). The vertical shift increases the accuracy of the target

location and should always be given if possible.

Note

When employing an instrument that provides greater accuracy than the

minimum requirements, it is acceptable to determine and transmit the more

accurate data.

b. Laser Polar. A MULE that has been oriented for direction

provides the quickest, most accurate means of target location. If the

firing unit has met its requirements for accurate fire, the mission

type for laser polar missions should be fire for effect. If not, one

round in adjustment is adequate. Not only do laser polar missions

provide a more accurate target location; the subsequent corrections

are processed differently from regular missions as well. Target

2-37
2-38

location is determined by the FDC by using vertical angle to the

nearest mu and incorporating distance as the slant range. An

oriented BC scope or aiming circle used with a laser rangefinder

can also be used to provide accurate laser polar data. Laser polar

data determines direction to the nearest mu, distance to the nearest

10 meters, and vertical angle (versus shift) to the nearest +1- 1 mu.

2202. Grid Coordinates. The observer can locate a target by using

the grid system of the military map. If the observer has conducted a

thorough terrain/map study, the grid coordinate method of target location is recommended. There is no requirement for the

observer's position to be known by the firing unit. The observer

normally locates targets to an accuracy of 100 meters (six-place

coordinates). When additional accuracy is required (e.g., known

points), the observer should locate targets to the nearest 10 meters

(eight-place coordinates).

a. Artillery and Mortars. The grid method of target location is

transmitted in the call for fire as "grid" followed by the

coordinates. OT direction can be transmitted after the call for fire

has been sent (ideally when reading back the message to observer

(MTO)), but it must be transmitted before or with the first

adjustment.

Example

"Grid 452 677."

b. Naval Gunfire. The grid method of target location is

transmitted in the call for fire as "grid" followed by the coordinates
and "altitude" followed by the altitude of the target measured from

sea level to the nearest 5 meters (or 20 feet). Direction is also

transmitted in the target location element if the method of control

is spotter adjust.

Example

"Grid 452 677, altitude 65, direction 0830."

or

"Grid 452 677, altitude 65, direction GTL."

2203. Shift From a Known Point. In shift from a known point,

the observer locates the target in relation to a known point. Target

location by shifting from a known point offers several

advantages—it is accurate, it does not require the use of a map, and

the observer's location is not required to be known by the firing

unit. However, the firing unit must know the location and altitude

of the known point. The known point may be a terrain reference

point that was previously reported or a target that was previously

fired on and recorded. For NGF, it may also be a radar beacon

position. The steps in locating a target by a shift from a known

point are as follows.

a. Step One. Identify the known point to be used.

(1) Artillery and Mortars. The known point is transmitted in the

warning order element of the call for fire by using the words "shift

known point (or target number) ______

2-39
2-40

(2) Naval Gunfire. The known point is transmitted in the target

location element of the call for fire by using the words "from

reference point (or target number)_______ b. Step Two. Determine the OT direction to the nearest 10 mils.

c. Step Three. Determine the lateral distance between the known

point and the target to the nearest 10 meters. This is a two-step

process. First, the observer determines the angular deviation in

mils between the two. Then, by using the mu-relation formula, the

observer multiplies the angular deviation (fir) by the range to the

known point (R) to the nearest 100 meters expressed in thousands

(called the shift factor) to determine the lateral shift (W) in meters.

(See figure 2-12 on page 2-41.) The lateral shift will be transmitted

in the call for fire as a "left" or "right" (meters are understood).

The shift factor is used to determine only the initial lateral shift.

The OT factor is used for all subsequent corrections. (See

paragraph 3302.)

Example

"Right 110."

Note

If the angular deviation is greater that 600 mils, use of the shift from a known

point should be avoided because the mu-relation formula becomes
d. Step Four. Determine the range shift in meters between the

known point and the target to the nearest 100 meters. The range

shift will be transmitted in the call for fire as an "add" if the target

is farther away from the observer than the known point or as a

"drop" if the target is closer. Meters are understood and need not

be specified.

2-41

Kno

Point

R

Tarset

Observer Formula

W=Rxm

Where Example

R = Obseiver-known point distance 3,100 = 3.1

(expressed in thousands to the nearest hundred meters)

m Angular deviation In mils (to the nearest mit) 35 W Lateral shift (to nearest 10 meters) 3.1 x 35 = 108.5

(Right 110)

Figure 2-12. Mu-Relation Formula in Shift From a Known

Point
2-42

Example

"Add 500."

e. Step Five. Determine the vertical difference between the known

point and the target. The vertical difference will be transmitted in

the call for fire as an up or down shift from the altitude of the

known point to the altitude of the target. Only vertical shifts of 35

meters or greater will be transmitted. In addition, any vertical shift

that is transmitted will be expressed to the nearest 5 meters (or 20

feet), if possible.

Example

"Up 35."

2204. Locating Targets in Mobile Operations. An observer with

a motorized or mechanized unit (e.g., mounted in trucks, assault

amphibian vehicles, or tanks) must be extremely proficient in his

duties, particularly map reading and terrain association.

a. Preparations. The success of the observer depends largely on

his preparations before the operation begins. These preparations

include the following:

• Become acquainted with the vehicle. The observer should learn

his position on the vehicle and the position of other team

members. He should ensure that the position assigned will allow

him to accomplish his mission; for example, it should allow him
to observe, communicate, and coordinate with other supporting

arms representatives.

• Ensure that required equipment/information is placed in an

accessible location for quick reference, for example, maps,

targets, radio, and frequencies.

• Study the map. The observer should study the map to the extent

that he can mentally picture what he expects to see, for example,

prominent landmarks. He should identify points or features

along the planned route from which he can readily determine his

orientation.

b. Considerations. The observer has to consider certain factors

when conducting target location in mobile operations. The most

important factors are direction, selection of method of target

location, and actions should the observer become disoriented.

(1) Direction. As a result of the observer's movement, it will be

necessary to change OT direction frequently. Another factor to

consider is the magnetic effect of the vehicle on the compass. The

observer will have to move 10 meters away from the vehicle to

avoid interference or use another method of determining direction,

for example, scaling from a map, estimating, or using the GTL.

(See paragraph 2102.)

(2) SeLection of Target Location Method. The grid method is the

fastest and most accurate method for mobile operations if the

observer has made a detailed map/terrain analysis. The observer

can call for fire on planned targets or use these targets to shift to a

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target of opportunity. The accuracy of the shift will largely depend

on the accuracy of the OT direction. The polar plot method is of

limited use in mobile operations unless the observer has short static

periods and constantly updates his position. Using GPS in these

situations makes polar plotting feasible.

(3) Actions Should the Observer Become Disoriented. As a

result of the tactical situation, the observer may have difficulty

maintaining adequate observation and orientation. This may make

it difficult to locate his own position and the target's location. In

these situations, the observer can call for fire on a p1annd target

and shift from the burst location. If the observer is completely

disoriented, he can call for "mark center of sector." (See paragraph

3104.) If there is doubt about the safety of the firing, a high air

burst (e.g., 200 meters) with shell high explosives (HE) or white

phosphorus (WP) can be used. The tactical soundness of the high

air burst must be considered. Knowledge of the tactical situation

and disposition of friendly forces by the firing unit will p:revent a

friendly unit from being fired on.
Chapter 3

Requesting and Adjusting Artillery, Mortars, and

Naval Gunfire

Section I. Artillery and Mortar Call for Fire

3101. Elements of the Call for Fire. The call for fire is "a request

for fire containing data necessary for obtaining the required fire on

a target." (Joint Pub 1-02) It is a concise message prepared by the

observer and transmitted as a request, not an order. It contains the

information needed by the FDC to determine the method of target

attack. The call for fire is sent quickly but clearly enough to be

understood, recorded, and read back without error by the FDC

recorder. In the FO team, the initial elements of the call for fire

should be sent by the radio operator while the FO determines the

remaining data, for example, target location. The radio operator

completes the call for fire as data becomes available. Regardless of

the method of target location used, the normal call for fire is

transmitted in three parts consisting of six elements with a break

and readback after each part. The parts and elements are as

follows:

• Observer identification and warning order

• Target location

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3-2

• Target description, method of engagement, and method of fire

and control.

3102. Observer Identification and Warning Order

a. Observer Identification. The first element of the call for fire,

observer identification, lets the FDC know who is calling for fire

and clears the net for the fire mission. The observer uses a call sign

and a suffix. Once given, call signs are omitted from subsequent

transmissions during the mission unless there is a chance of

confusion, for example, when missions are being conducted

simultaneously by other observers. (See figure 3-1 on page 3-3.)

b. Warning Order. The second element, warning order, is "a

preliminary notice of an order or action which is to follow." (Joint

Pub 1-02) The warning order consists of the type of mission, the

size of the element to fire for effect, and the identification of the

method of target location. (See figure 3-1.)

(1) Type of Mission. The observer selects a type of mission. The

type of mission can be adjust fire, fire for effect, suppression,

immediate suppression/smoke, or suppression of enemy air

defenses (SEAD). The suppression and immediate suppression

missions are discussed in paragraph 3105. Immediate smoke is

discussed in paragraph 5705. SEAD is discussed in chapter 8. The

adjust-fire mission is requested when the observer decides that an

adjustment is needed because of questionable target location or

lack of registration corrections. For this mission, the observer

announces "adjust fire" in the warning order. The fire-for-effect
mission is used when the observer has an accurate target location

and is certain that the first volley will have an effect on the target.

For this mission, the observer announces "fire for effect" in the

warning order. The accuracy required to fire for effect depends on

the target and the ammunition being used. The observer should

strive for first-round fire for effect.

Situation I

(Grid Method of Target Location)

Observer: "R2S this is W2P31, adjust fire, over."

FOG: "P31 this is R2S, adjust fire, out."

Situation 2

(Polar Plot Method of Target Location)

Observer: "R2S this is W2P31, adjust fire, polar, over."

FDC: (FDC reads back.)

Situation 3

(Shift From a Known Point Method of Target Location)

Observer: "R2S this is W2P31 fire for effect, shift AB 1037,

over."

FDC: (FDC reads back.)

Note: The observer used the fire-for-effect type of mission in situation

3 because he had a good target location.

Figure 3-f. Examples of Observer Identification and Warning

Order.

(2) Size of Element To Fire for Effect. The observer may request

the size of the unit to fire for effect, for example, a battalion. This

is usually done by announcing the last letter in the battalion FDC's

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call sign. For example, T6H24 will be announced "HI." The

observer should never refer to a unit in the clear. If the observer

does not specify a size of element to fire for effect, the FI)C will

make the decision based on the attack guidance received and the

Joint Munitions Effectiveness Manual (JMEM) solution. Mortars

may be employed by platoon or section, which must be specified.

(3) Method of Target Location. The observer identifies in the

warning order the method that he will use to locate the target. The

method of target location may be polar, grid, or shift from a known

point. (See chapter 2.) If the observer is using either the polar or

shift method, he announces the method, for example, "polar" or

"shift (identify known point)." If the observer is conducting a laser

polar plot, he should announce "laser polar." This will facilitate

fire direction. There is no requirement to announce "grid" in the

warning order for the grid method of target location.

3103. Target Location. The third element of the call for fire is

target location. The observer provides the FDC with the target

location data that he determined by using either the grid, polar, or

shift method. The firing unit uses the data to determine firing data.

(See figure 3-2 on page 3-5.) The observer transmits the target

location data as described below.

a. Grid. The observer announces the word "grid" followed by the

coordinates of the target.

b. Polar. The observer announces the word "direction" followed

by the spotting line (e.g., 1680), "distance" followed by the
distance from the observer to the target (meters understood), and, if

possible, an "up" or "down" vertical shift.

Situation I

(Continued from Figure 3-1)

(Grid Method of Target Location)

Observer: "Grid 347 689, over."

FDC: "Grid 347 689, out."

Situation 2

(Continued from Figure 3-1)

(Polar Plot Method of Target Location)

Observer: "Direction 1680, distance 3500. down 35, over."

FDC: (FDC reads back.)

Situation 3

(Continued from Figure 3-1)

(Shift From a Known Point Method of Target Location)

Observer: "Direction 0680, right 250, add 200, over."

FDC: (FOC reads back.)

Figure 3-2. Examples of Target Location.

c. Shift From a Known Point. The observer announces the word

"direction" followed by the spotting line, the lateral shift (if any)

transmitted as "left" or "right," the range shift (if any) transmitted

as "add" or "drop," and, if applicable, an "up" or "down" vertical

shift. Laser polar missions always announce vertical angle.

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3-6

3104. Target Description, Method of Engagement, and Method

of Fire and Control

a. Target Description. The fourth element of the call fbr fire,

target description, is the element in which the observer describes

the target in enough detail to enable the FDC to determine the

amount and type of ammunition to be used. The observer's

description should be brief but accurate and contain the following:

• What the target is (troops, supply dump, trucks)

• What the target is doing (digging in, in assembly area)

• The number of elements in the target (squad, three trucks)

• The degree of protection (in the open, in fighting holes, in

bunkers with overhead protection)

• Target size and shape, if these are significant.

(1) Rectangular Targets. Rectangular targets are greater than 200

meters in length and width. They are described by the length and

width of the target and the attitude (the azimuth of the long axis

(0000-3200) in relation to grid north) to the nearest 100 mils.

Example

"400 by 200, attitude 2800."
(2) Circular Targets. Circular targets are for irregular-shaped

targets with a radius greater than 100 meters. They are described

by using the radius of the target area.

Example

"Radius 200."

(3) Linear Targets. Linear targets are targets greater than 200

meters long but less than or equal to 200 meters wide. They are

described by an attitude and a length.

Example

"Length 400, attitude 1300."

(4) Irregular-Shaped Targets. Irregular-shaped targets are

described by using the location of the target center, the length and

depth (in meters), and, if required, the attitude. Sufficient detail

should be provided to enable the FDC to determine the method of

attack.

b. Method of Engagement. The fifth element of the call for fire,

method of engagement, is the element that the observer uses to

describe the attack of the target. The subelements of the method of

engagement include the type of adjustment, mark, danger close,

trajectory, ammunition, and distribution. Some of the subelements

are standard and will be provided automatically unless the observer

specifies otherwise. The standard type of adjustment is area fire;

the standard trajectory is low angle for artillery (high angle for

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3-8

mortars); the standard ammunition is shell HE/fuze quick (HE/Q);

the standard distribution is a circular sheaf for artillery (parallel

sheaf for mortars). Nonstandard subelements must be addressed in

the call for fire when required, for example, danger close if the

target is near a friendly position. The subelements of the method of

engagement are transmitted (as required) in the following

sequence.

(1) Type of Adjustment. Two types of adjustment may be

employed—precision or area fire. Unless precision fire is specified,

area fire will be used. Precision fire is conducted with one weapon

on a point target. It is used either to obtain registration corrections

or to destroy a target. When the mission is a registration, it is

initiated by the FDC with an MTO. (See chapter 5, sections II and

III). If the target is to be destroyed, the observer announces

"destruction." Area fire is used to attack an area target. I3ecause

many area targets can move, the adjustment should be made as

rapidly and as accurately as possible to keep the target from

escaping. A well-defined point should be selected at or near the

center of the area to be attacked and used as an adjusting point. To

achieve surprise, fire should be adjusted on an auxiliary adjusting

point. After adjustment is completed, the fire for effect is shifted to

the target. Normally, adjustment on an area target is conducted

with one adjusting weapon.

(2) Danger Close. "Danger close" is included in the method of

engagement when the predicted impact of a round or shell is within

600 meters of friendly troops for mortars and artillery. When

alerted that the target is danger close, the FDC will take added
precaution in the delivery of fires. The observer will use the

creeping method of adjustment. (See paragraph 3302.e.) Omission

of this subelement indicates that the target is away from a friendly

position by at least the distances stated above. Minimum safe

distances provide a 99-percent assurance that a casualty-producing

hit on friendly troops will not occur. (See appendix A.)

(3) Mark. The term "mark" is included in the method of

engagement to indicate that the observer is going to call for rounds

either to orient himself in his zone of observation or to indicate

targets to ground troops, aircraft, or other observers. This term is

included in the method of engagement only when needed.

Example

"Mark center of sector."

(4) Trajectory. There are two types of trajectory—low-angle fire

and high-angle fire. For artillery, low-angle fire is standard and

need not be specified. If high-angle fire is desired, it must be

specified. For more information on high-angle fire, see chapter 5,

section I.

Example

"High angle."

For mortars, high-angle fire is standard and need not be specified.

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3-10

(5) Ammunition. Several types of ammunition are available to the

observer. The standard type of ammunition is HE/Q. If HE

ammunition is specified in the call for fire, HE/Q will be fired in

the adjustment and fire-for-effect phases. The term "in effect"

indicates that the projectile/fi.ize specified is desired during fire for

effect. Nonstandard types of ammunition are specified in the call

for fire. The observer must state either a projectile or a fuze, for

example, "shell 1CM" (projectile) and "VT in effect" (ftize).

Illumination, 1CM, and smoke can only be fuzed with fuze time.

Therefore, when firing these projectiles, fuze time is understood

and need not be specified. See appendix A for a discussion of

projectiles and fizzes.

(6) Volume of Fire. The observer may request the number of

rounds to be fired in effect. For example, "three rounds" indicates

that the firing unit fires three volleys during the fire for effect. This

equates to 18 rounds fired by a six-howitzer battery. If not

requested, the volume of fire is determined by the fire direction

officer (FDO) and announced in the MTO.

(7) Distribution. In artillery, the observer may control the pattern

of bursts in the target area. The pattern of bursts is called a sheaf.

The sheaf denotes the lateral distribution of bursts of two or more

pieces fired together. Special sheafs of any length and width may

be requested. When target length and width are given, attitude

must also be given. When target length is equal to or greater than

five times the target width, the battery computer system (BCS)

assumes a linear target. Figure 3-3 on page 3-1 1 depicts the various

sheafs. In mortars, the mortar ballistic computer (MBC) assumes
that the target is linear and fires a parallel sheaf unless a special

sheaf is requested.

ç)( : :

/7b'<\ /7r

Unless otherwise requested, the BCS A converged sheaf places all rounds on a

assumes a circular target with a 100-meter specific point and is used for small hard

radius. The BCS determines individual targets.

weapon aiming points around the target.

Circular Sheaf Converged Sheaf

C:):>c :>cc:>c:> C) :) :

1 7/ \ cy

An open sheaf separates the burst by the A parallel sheaf places the bursts of all

maximum effective burst width of the shell pieces parallel. This sheaf is normally used

fired, when firing data is computed manually.

Open Sheaf Parallel Sheaf

Figure 3-3. Sheafs.

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3-12

c. Method of Fire and Control. The sixth element of the call for

fire, method of fire and control, indicates the desired manner of

attacking the target, whether or not the observer wants to control

the time of delivery of fire, and whether or not he can observe the

target. (See figure 3-4 on page 3-13.) Methods of fire and control

are announced by the observer as discussed below.

(1) Method of Fire. In area fire, adjustment is normally conducted

with one howitzer or with the center gun of a mortar platoon or

section. Adjusting at long ranges, however, may sometimes be

easier with two howitzers or guns firing. If the observer determines

that a two-howitzer/gun adjustment is more appropriate for the

mission, he may specif' "two guns adjust" for artillery or "section

adjust" for mortars. If, either for adjustment or effect, the observer

wants the firing unit to fire by pieces from right to left or left to

right, he specifies the unit and indicates right by piece (for left to

right) or left by piece (for right to left), for example, "battery right

by piece." The normal time interval between rounds fired in a

platoon or battery right (left) is five seconds. The observer may

specify a different time interval if desired.

(2) Method of Control. In the absence of a specified method of

control, fire missions are executed by the firing unit when ready.

(a) At My Command. If the observer wants to control the time of

delivery of fire, he announces "at my command" in the method of

control. When the pieces are ready to fire, the FDC announces

"section/platoon/battery/battalion is ready, over" (call signs are

used). The observer announces "fire" when he is ready for the
pieces to fire. This only applies to adjusting rounds and the first

volley of a fire for effect. At my command remains in effect during

the mission until the observer announces "cancel at my command,

over."

Situation I

(Continued from Figure 3-1).

(Grid Method of Target Location)

(Observer desires to adjust with HE/Q then fire for effect with WP.)

Observer: "Five trucks refueling in the open, WP in effect, over."

FOC: (FDC reads back.)

Situation 2

(Continued from Figure 3-1)

(Polar Plot Method of Target Location)

(The target is danger close. Observer desires HE/Q or to let the FDC

select the projectile/fuze.)

Observer: "Infantry platoon in the open, danger close, over."

FOG: (FOG reads back.)

Situation 3

(Continued from Figure 3-1) (Shift From a Known Point Method of Target Location)

(The observer selects a sheaf to concentrate the fires on a specific

point and desires to control the timing of the fires.)

Observer: "Machine gun position, converged sheaf, at my

command, over."

FDC: (FOC reads back.)

Figure 3-4. Examples of Target Description, Method of

Engagement, and Method of Fire and Control.

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3-14

(b) By Round At My Command. At my command can be further

specified. By round at my command controls every round in

adjustment and every volley in the fire-for-effect phase. By piece,

by round, at my command, further combines method of fire with

method of control and can include right or left or a duration.

(c) Do Not Load. Do not load allows the howitzer/gun section to

prepare ammunition and lay on the target without loading the

howitzer. When the command "cancel do not load" is transmitted,

the section automatically loads and fires the weapon (except for an

at my command mission). Do not load is the recommended method

of control for long wait or uncertain missions.

(d) Cannot Observe. Cannot observe indicates that the observer

cannot see the target. This may be because of vegetation, terrain,

weather, or smoke. Cannot observe is used when there is a reason

to believe that a target exists at a given location and the target is

important enough to justify firing without adjustment.

(e) Time on Target. Time on target (TOT) is a method of firing on

a target in which a unit times its fire so that the initial round strikes

the target at the time specified. The observer indicates TOT by

using one of the techniques discussed in appendix D.

(f) Continuous Illumination. Continuous illumination is a type of

fire in which illumination projectiles are fired at specified time

intervals to provide uninterrupted lighting on the target or specified

area. The interval may be specified by the observer (in seconds) or

determined by the FDC. If no interval is given by the observer, the
FDC determines the interval by the burning time of the

illumination ammunition in use. Continuous illumination must be

used with discretion to avoid excessive ammunition expenditure.

(g) Coordinated Illumination. Coordinated illumination is a type

of fire in which the firing of illuminating and HE projectiles is

coordinated to provide illumination of the target and surrounding

area only at the time required for spotting and adjusting fire. The

observer may allow the FDC to control the firing of the

illumination and HE rounds by marking the illumination round

when it provides optimal illumination on the target, or he may

control the firing of each round by using procedures of by round at

my command. (See paragraph 5604.)

(h) Cease Loading. The command "cease loading" is used during

the firing of two or more rounds to stop the loading of rounds into

the gun(s). The gun section may fire any rounds that have already

been loaded.

(i) Check Firing. The command "check firing" is used to cause an

immediate halt in firing. Once check firing has been announced,

the command "cancel check firing" must be given to resume firing.

U) Continuous Fire. Continuous fire means loading and firing as

rapidly and as accurately as possible within the prescribed rate of

fire for the equipment. Firing will continue until suspended by the

command "cease loading" or "check firing."

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3-16

(k) Repeat. During adjustment, "repeat" means to fire another

round by using the same firing data used to fire the previous round

and adjust for any change in ammunition. Repeat is not sent in the

initial call for fire.

Example

"Time, repeat, over.

During fire for effect, "repeat" means to fire the same number of

rounds using the same method of fire for effect. Changes in the

number of guns, previous corrections, interval, or ammunition may

be requested.

3105. Call for Fire for Suppressive Fire. Suppressive fires are

"fires on or about a weapons system to degrade its performance

below the level needed to fulfill its mission objectives, during the

conduct of the fire mission." (Joint Pub 1-02) Suppressive fires are

delivered as a suppression mission or as an immediate suppression

mission. A suppression mission is used to fire on a planned target

that is not currently active. An immediate suppression mission is

used to fire on a planned target or target of opportunity that has

taken friendly maneuver or aerial units under fire. Both the

suppression and immediate suppression missions yield suppressive

results only during the time when the fire is being delivered. Firing

on a planned target is more responsive than firing on a target of

opportunity. It is important that the maneuver unit does something

while the suppressive fires are making impact, for example,
maneuver against the target, position the observer to adjust fire to

neutralize the target, or bypass the target.

a. Suppression Mission. The call for fire consists of the observer

identification, the warning order "suppress," the target number of

the planned target, and the duration and rate of fire. This call for

fire is sent in one transmission.

Example

Observer: "R2S this is W2P31 suppress AS 3104, four minutes, four shells

per minute, over."

FDC: P31 this is R2S, suppress AB 3104, four minutes, four shells per

minute, authenticate DELTA JULIETT, over."

Observer: l authenticate DELTA, out."

b. Immediate Suppression Mission. An immediate suppression

mission normally requires a minimum volume of fire. The type of

ammunition, units to fire, and volume are established by unit SOP,

for example, two sections, one round of HE/point detonating (PD),

one round of HE/fuze variable time (VT). The call for fire is sent in

one transmission. The call for fire consists of the observer

identification, the warning order "immediate suppression," the

target location, and transmission authentication. (See paragraph

3108.)

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3-18

Example

Observer: "This is W2P31, immediate suppression, grid 221 432,

authentication is TANGO UNIFORM, over."

FDC: "This is R2S, immediate suppression, grid 221 432, out."

3106. Direction. In artillery and mortars, direction is not included

in the initial call for fire when the grid method of target location is

used. When conducting a grid mission, the observer transmits the

direction when reading back the MTO or with the first subsequent

correction in adjustment.

3107. Message to Observer. After receiving the call for fire, the

FDO determines how the target will be attacked. That decision is

announced to the observer in the form of an MTO, which the

observer reads back. The MTO should be sent to the observer

before the first subsequent correction. At a minimum, the MTO

will consist of unit(s) to fire, any changes to the call for fire,

number of rounds, and target number. The FDC will provide other

information, as required.

Note

An MTO is not transmitted for an immediate suppression mission.

a. Units to Fire. Units to fire refers to the batteries or battalion that

will fire the mission. If the battalion is firing for effect with one

battery adjusting, the FDC designates the fire-for-effect unit
(battalion) and then the adjusting unit (ALFA battery) by using the

last letter of the call sign.

Example

ALFA battery (R6G) will adjust, and the battalion (A8T) will fire for effect.

The MTO would begin "T, G.

b. Changes to the Call for Fire. Any changes to the observer's

request in the call for fire are announced.

Example

The observer requested 1CM in effect, and the FDO decides to fire VT in

effect. The MTO would be "T, G, VT in effect.

c. Number of Rounds. This is the number of rounds per tube in

fire for effect.

d. Target Number. A target number is assigned at the FDC to

each mission to facilitate processing of subsequent corrections.

Example

"T, G, VT in effect, four rounds, target AA 7732, over.'

e. Other Information as Required

(1) Probable Error in Range. Probable error in range (PEa) is the

distance in meters over and short of a given point of aim within

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which 50 percent of all rounds fired are likely to fall. (See figure

3-5 on page 3-2 1.) For example, for an M198 howitzer firing HE at

a range of 6,000 meters (charge 5-GB), one PER is nine meters.

There is a 50-percent chance that any given round will impact nine

meters over or short of the point of aim when fired at this range.

The remaining rounds will impact within four PER or 36 meters

over or short of the target (as depicted by the box in figure 3-5). By

contrast, one PER for the same weapon firing at a range of 14,000

meters is 20 meters. PER varies with several factors, for example,

range, propelling charge, ammunition, and weapon. The FDC

normally selects the optimal firing data to minimize PER. However,

circumstances (e.g., intervening crests, counterfire threat) may

require the selection of a less than optimal gunnery solution. The

FDC reports the PER when it is excessive to prevent the observer

from attempting to correct the impact of a round caused by natural

dispersion, for example, when the PER is equal to or greater than

38 meters during an area fire mission and 25 meters or greater in a

precision fire mission such as registrations or destruction.

(2) Angle T. Angle T is the angle formed by the intersection of the

0Th and the GTL with the vertex of the angle at the target

location. Angle T is sent to the observer when it is greater than or

equal to 500 mils, or when requested. See figure 3-10 on page 3-53

for the effect of angle T on the adjustment of fire.

(3) Time of Flight. Time of flight (TOF) is the time in seconds

from the instant when a weapon is fired to the instant when the

round strikes or detonates. TOF is sent to an observer when

adjusting high-angle fire, during a moving-target mission, for
Copperhead missions, when firing for an aerial observer, for shell

HE in a coordinated illumination mission, when using "by shell at

my command," or when requested.

Mean Point of Impact (MPI)

2% 7% 16% 25% 25% 16% 7% 2%

• • •S. • •

S •.S. ••• • — —• • •Liniof

Fue . .• • . •.* ••S..S •• S • • • • •• •. •• •..S ••S S •S... S . r

LOne Probable Error in Range

Figure 3-5. Probable Error in Range.

Note

The MTO for registrations is discussed in chapter 5.

3108. Authentication. The two methods of authentication that are

authorized for use are challenge-and-reply and transmission

authentication. For instructions on authentication procedures, refer

to the automated communications-electronics operating

instructions (CEOI).

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3-22

a. Challenge-and-Reply Authentication. Challenge-and-reply

authentication is considered to be a normal element of initial

requests for fire. The FDC inserts the challenge in the last readback

of the fire request. The P0 transmits the correct authentication

reply to the FDC immediately following the challenge.

Authentication replies exceeding 20 seconds are automatically

suspect and a basis for rechallenge. Subsequent adjustment of fire

or immediate engagement of additional targets by the observer

originating the initial fire request normally will not require

continued challenge by the FDC.

b. Transmission Authentication. Transmission authentication

will be used only if authentication is required and it is not possible

or desirable for the receiving station to reply, for example, message

instruction, imposed radio silence, FPF, and immediate

suppression.

Example

(Challenge and Reply)

FDC: "Authenticate ALFA, BRAVO, over."

Observer: "I authenticate CHARLIE, out."

Example

(Transmission Authentication)

Observer "Authentication is TANGO UNIFORM, out."
3109. Report Upon Firing

a. Shot. The firing unit will transmit "shot" after each round fired

in adjustment and after the initial round in the fire-for-effect phase.

The observer acknowledges each.

b. Splash. When requested, the transmission of "splash" by the

FDC informs the observer when his round is five seconds from

detonation. Firing units should automatically report "splash"

during high-angle firing, when the observer is airborne, and for

other missions when requested by the observer. When reported,

"splash" should be transmitted for each round in adjustment and

for the initial round in each volley of fire for effect. In coordinated

illumination missions, "splash" is reported for illumination rounds

fired before the beginning of the HE adjustment phase of the

mission and only for HE rounds thereafter. When in the assault,

"splash" allows the supported unit to close with their fires. It

allows the observer to remain under cover and concealment while

awaiting the fires, thus enhancing his survivability. This

transmission also helps the observer to identify or observe his

rounds if other fire missions are being conducted in the area. The

observer is not required to acknowledge the transmission.

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Example

FOC: "Splash, out."

3110. Correction of Errors. Errors are sometimes made by the

observer in transmitting data or by the FDC personnel in reading

back the data. If the observer realizes that an error has been made,

he announces "correction" and transmits the entire corrected

transmission.

Example

The observer transmitted, "Al B this is C2D, adjust fire, shift known point two,

over, direction 4680. . . " The observer realizes before proceeding that the

direction should have been 5680. To correct the error, he transmits,

"Correction, direction 5680."

When an error has been made in a subelement and the correction of

that subelement will affect other transmitted data, the word

"correction" is announced. Then the correct subelement and all

affected data are transmitted in the proper sequence.

Example

The observer transmitted, "Left 200, add 400, up 40, over."

(The correction should have been "Left 200, drop 400, up 40.")

To correct the error, he transmits, "Correction, left 200, drop 400, up 40,

over."

3111. Call for Fire From Headquarters Higher Than Battalion.

Calls for fire from higher headquarters are similar in format to
those transmitted by observers. The call for fire from higher

headquarters may specif' the unit to fire for effect. However, the

observer's call for fire can only request a firing unit. A call for fire

from a higher headquarters is shown in the following example.

Example

Warning order: "Fire for effect, A8B (battalion), over."

Target location: "Grid 432 789, altitude 520, over."

Method of engagement: "VT, three rounds."

Method of control: "TOT 1600, over."

Section II. Naval Gunfire Call for Fire

3201. Fire Unit Status. A ship is assigned a fire support area

(FSA) or a fire support station (FSS) from which to fire. When a

ship arrives in its assigned firing position and has completed its

prefiring tasks, it will report "on station and ready to fire" as a part

of the guns up ready to fire (GURF) report. The (3URF report may

include other pertinent information, for example, types and

quantities of ammunition available for NGF support. The GURF

report may be requested at other times by the NGLO or the spotter.

3202. Elements of the Call for Fire. The spotter must

communicate effectively with the ship to perform his primary duty

of providing NGF. The spotter achieves this by employing a

standard call for fire. The call for fire is transmitted to the ship in

two transmissions consisting of six elements, with a readback after

each transmission. The sequence of these two transmissions is as

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follows: spotter identification, warning order and target number,

target location, target description, method of engagement, and

method of control.

3203. Spotter Identification, Warning Order, and Target

Number

a. Spotter Identification. The spotter identification tells the ship

who is calling for fire. The spotter and the ship will use call signs.

Once given, call signs will normally be omitted from subsequent

transmissions in the course of the mission. (See figure 3-6 on page

3-27.)

b. Warning Order. The warning order informs the ship that a call

for fire is being transmitted. It clears the net and warns the ship

that firing on a target is desired. The warning order consists of the

words "fire mission." (See figure 3-6.)

c. Target Number. The spotter assigns a target number to each

target on which he calls for fire. By use of a target number, the ship

and the NGLO monitoring the mission are able to keep track of

each location being fired on. The target number consists of two

letters followed by four numbers. For targets of opportunity, the

spotter assigns each fire mission a number in numerical sequence

from the block of target numbers allocated by the FSCC, or the

FSCC may assign the target number. In the case of planned targets,

the spotter uses the previously assigned target number. The

assignment of target numbers to fire missions in the call for fire
does not cause the targets to be recorded as targets. (See paragraph

3303.)

Situation I

Spotter: "A1B, this is C2D, fire mission, target numberAB 2135, over."

Ship: "C2D, this is A1B, fire mission, target numberAB 2135, out."

Figure 3-6. Example of Spotter Identification, Warning Order,

and Target Number.

3204. Target Location, Target Description, Method of

Engagement, and Method of Control

a. Target Location. Target location provides the ship with the

information needed to plot the target and determine firing data.

(See chapter 2, section Il.) The observer transmits target location

data as described below.

(1) Grid. The spotter announces "grid" followed by the

coordinates of the target; "altitude" followed by the altitude of the

target, which is measured from mean sea level (meters

understood); and "direction" followed by the spotting line if the

method of control is spotter adjust.

(2) Polar. The spotter announces "direction" followed by the

spotting line (e.g., 1680), "distance" followed by the distance from

the spotter to the target (meters understood), and an up or down

vertical shift.

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(3) Shift From a Known Point. The spotter announce:s "from

reference point" (or target number), "direction" followed by the

spotting line, the lateral shift (if any) transmitted as a left or right,

the range shift (if any) transmitted as an add or drop, and an up or

down vertical shift.

b. Target Description. Target description gives a brief description

of the target. The spotter considers the type of target, size, and

degree of protection when formulating target description.

(1) Type of Target. Type of target includes what the target is and

what the target is doing, for example, troops digging in or trucks in

convoy.

(2) Size. Size includes the number of elements in the target or

physical dimensions (meters understood). For target attitude, mils

grid is understood.

Example

"Five trucks, 100 troops, 400 x 400 attitude 1600."

(3) Degree of Protection. Degree of protection indicates whether

the target has protection, for example, in the open or in bunkers

with overhead cover.

c. Method of Engagement. Method of engagement is the element

that the spotter uses to describe the attack of the target. The

subelements of the method of engagement include danger close,
trajectory, ammunition, armament, number of guns, number of

salvos, and special instructions. Some of the subelements are

standard and will be provided automatically unless the spotter

specifies otherwise. The standard method of engagement for

trajectory uses a full charge, which produces a high muzzle

velocity and a normal trajectory. The standard method of

engagement for ammunition is HE/Q; for armament, it is main; for

number of guns, it is one gun; and for number of salvos, it is one

salvo. Nonstandard subelements must be addressed in the call for

fire when required. An example is when the observer specifies

danger close when the target is (and, therefore, the round will

impact) near a friendly position. The subelements of the method of

engagement are transmitted (as required) in the following

sequence.

(1) Danger Close. The term "danger close" is included in the

method of engagement when there are friendly troops or positions

within a prescribed distance of the target. Danger close for

unobserved or initial salvos of NGF projectiles that are smaller

than 6 inches is 750 meters.

(a) The spotter reports "danger close" followed by a cardinal or

intercardinal direction (based on grid north) and distance (in

meters) from the target to the nearest friendly position. The spotter

also designates the place where the first salvo (round) is to impact.

The first salvo can be either offset or directed at target.

(b) The first salvo may be offset to impact on the side of the target

opposite the location of the friendly forces or a restricted target, for

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example, class E. See MCWP 3-31.1/NWP 3-09.11, Supporting

Arms in Amphibious Operations. This is done by a normal

correction (left/right, add/drop) made in relation to the spotting

direction or as a cardinallintercardinal direction and distance (in

meters). The offset between the nearest friendly position and the

first salvo can be any distance specified by the spotter but is

normally at least 750 meters for five-inch NGF.

Example

'Danger close south 350." (South 350 indicates friendly position in relation to

target.) "First salvo at north 400." (The correction north 400 positions the

offset at least 750 meters from the friendly position (350 meters + 400 meters

= 750 meters).) The first salvo may be directed at the target when the tactical

situation does not permit an offset. An example is 'first salvo at target."

(2) Trajectory. This subelement applies to ships that are capable

of reduced-charge or high-angle firing. The normal trajectory is flat

and fired at full-charge propellant. The normal trajectory is

standard; if this subelement is omitted in the call for fire, the ship

will fire full charge. The spotter or ship may specify a nonstandard

trajectory when required. The nonstandard trajectories are reduced

charge and high angle.

(a) Reduced Charge. This is required when intervening terrain

prevents engagement of targets in defilade. The spotter or ship

raises the trajectory to increase the angle of fall by announcing

"reduced charge." In addition, reduced charge lowers the initial

velocity of the projectile. This prevents the ripping of illumination

parachutes and increases the accuracy at short ranges. Once
reduced charge has been initiated, it can be terminated by the

command "cancel reduced charge."

(b) High Angle. High angle is fired with a full charge. It is used to

engage targets in defilade when extended range or other

considerations prevent the use of reduced charge. The spotter or

the ship announces "high angle." Once initiated, it can be

terminated by the command "cancel high angle."

(3) Ammunition. Several types of ammunition are available to the

spotter. The standard type of ammunition is HE/Q (PD).

(a) If no ammunition is specified in the call for fire, HE/Q will be

fired in the adjustment and fire-for-effect phases. The term "in

effect" indicates that the projectile/ftize specified is desired during

the fire for effect.

(b) Nonstandard types of ammunition are specified in the call for

fire. The spotter must state either a projectile or a fuze, for

example, "shell WP" (projectile) or "fuze CVT" (fuze). When

firing illumination, the fuze is understood to be fuze time and need

not be specified.

(c) As much warning as possible should be provided to the ship

when a mission requires a nonstandard projectile. This allows time

to ready the ammunition in the gun mount. The quantities of

nonstandard ammunition carried in the ship's magazine are limited.

See appendix A for a discussion of projectiles and fuzes.

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(4) Number of Guns. The spotter may specify the number of guns

to be used in adjustment and fire for effect. If the number of guns

for effect is not specified, it is understood to be the same number

as used in adjustment. One gun is considered to be the standard and

need not be specified. If more than one gun is desired, the number

of guns must be specified, for example, "two guns."

(5) Number of Salvos. The term "salvo" refers to the method of

fire in which a weapon, or number of weapons, is fired at a target.

It indicates the number of projectiles to be fired from each gun.

Example

Five salvos equals five projectiles to be fired, while two guns five salvos

Number of salvos is sent when entering fire for effect or when the

spotter desires to adjust with multiple salvos. If the method of

control is spotter adjust, the number of salvos is omitted until the

spotter is ready to enter fire for effect. If omitted, the ship will fire

one salvo.

Example

Two salvos in adjustment.'

(6) Special Instructions. The spotter uses special instructions in

the call for fire when he desires the use of specific, nonstandard

techniques to attack the target.
(a) Interval. Interval is a special instruction that is used to cause

fire-for-effect rounds to be fired with a specific time interval

between each salvo. The spotter announces "interval" followed by

a desired time interval (seconds understood).

I Example

"10 salvos, interval 30, fire for effect."

(b) Sustained Fire. The sustained fire command is given if there is

a requirement for fire for effect to be spread over a specific period

of time. The spotter specifies "sustained fire." The command

includes the number of salvos and the period of time in which they

are required to be fired.

Example

"20 salvos, sustained fire, five minutes, fire for effect."

(c) Time on Target. TOT is used by the spotter when he wants the

initial salvos in fire for effect to impact the target at a specified

time. He may use any of the techniques described in appendix D.

(d) Coordinated Illumination. The coordinated illumination

command is used by the spotter to inform the ship that, subsequent

to adjusting illumination, the spotter will request simultaneous HE

fire. He does this by announcing "coordinated illumination."

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(e) Continuous Illumination. The continuous illumination

command is used when the spotter requires constant light on a

target. The spotter may specify a period of time during which the

illumination is to be effective. The ship determines the interval for

firing the subsequent illumination salvos on the basis of the

burning time of the projectile. The spotter commands "continuous

illumination." This command should be used with discretion to

avoid excessive expenditure of ammunition.

d. Method of Control. Method of control indicates the spotter's

desire or ability to control the delivery of fire. The standard

method of control is spotter adjust and is omitted in the call for

fire. The nonstandard methods of control are fire for effect and ship

adjust. Fire for effect can be modified by the command "cannot

observe." All methods of control can be modified by the command

"at my command."

(1) Spotter Adjust. When there is doubt about target location or

firing accuracy, the spotter will adjust salvos until he is sure that

fire will impact the target. This method is understood to be

standard and is omitted from the call for fire. The spotter may state

this when he desires to revert to adjustment during a mission.

(2) Fire for Effect. The spotter should strive for fire for effect with

the first round or as soon as possible in the adjustment phase.

When determining whether or not to fire for effect on the first

round, the spotter must consider the target location and how

accurately the ship has been firing its initial rounds on previous

missions. He must also consider the dispersion pattern of NGF. If
the spotter believes that the first salvo will affect the target, the

best results are normally achieved by surprise fire. When fire for

effect is desired, the spotter specifies the number of salvos (and

number of guns if different from that used in adjustment) and "fire

for effect."

Example

"10 salvos, fire for effect."

"Fire for effect" can be modified by the command "cannot

observe" when the spotter desires to fire on a suspected target or a

target provided by intelligence sources. "Cannot observe" is used

when neither the spotter nor the ship can see the target. The spotter

must specify the number of salvos to be fired in the method of

engagement.

Example

"Two guns, four salvos, cannot observe, fire for effect."

(3) Ship Adjust. This method of control is employed when the

spotter believes that the ship has a better view of the target than he

does. Because direct fire is faster and more accurate, this thethod is

used whenever possible. After the spotter has positively identified

the target to the ship, he announces "ship adjust." The ship then

takes the target under fire. The spotter may assist the ship by

providing range spottings along the GTL, particularly when he is

looking perpendicular to the GTL.

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(4) At My Command. At my command is used as a modifier to

the three methods of control. At my command may be used when

the spotter wants to control the precise firing of each salvo in

spotter adjust and the first salvo of fire for effect. He includes "at

my command" in the method of control. When the ship is prepared

to fire each round, the ship will transmit "ready over." The spotter

then commands "fire" when he is ready for the ship to fire the

round. At my command remains in effect throughout the mission

or until the spotter announces "cancel at my command." At my

command is frequently used by aerial observers. (See figure 3-7 on

page 3-3 7.)

e. Prefiring Report. After the ship receives the call for fire and

determines firing data, a report will be made to the spotter before

firing begins. The spotter reads back this transmission to the ship

and commands "break. . . fire, over." The transmission consists of

the following information.

Example

"Fire for effect, at my command."

(1) Gun-Target Line. The ship will report its firing direction by

using the same north reference and units used by the spotter. The

ship will notify the spotter of subsequent changes to the GTL of

200 mils (10 degrees) or more. If the direction used for adjustment

is the GTL, the ship will use mils grid in the call for fire if the

direction in the call for fire was a cardinallintercardinal direction, a

GTL, or an arbitrary reference feature or if direction was omitted.
Situation I

(Continued from Figure 3-6)

(Grid Method of Target Location, Spotter Adjust Mission)

Spotter: "Grid 786 543, altitude 05, direction 2680, 50 troops in

open, fuze CVT in effect, over."

Ship: (Ship reads back.)

Situation 2

(Continued from Figure 3-6)

(Polar Plot Method of Target Location, At My Command Mission)

Spotter: "Direction 2680, distance 3000, down 40, 50 troops in

open, fuze CVT in effect, at my command, over."

Ship: (Ship reads back.)

Situation 3

(Continued from Figure 3-6) (Shift From a Known Point Method of Target Location, At My Command

Mission)

Spotter: "From target number AB 3772, direction 3470, left 280,

add 500, supply depot in defliade, radius 200, reduced

charge, two guns 10 salvos, fire for effect, at my

command, over."

Ship: (Ship reads back.)

Figure 3-7. Examples of Target Location, Target Description, Method of Engagement, and Method of Control.

(2) Line of Fire. If the ship is firing illumination, the firing

direction may not pass over the target because of wind drift of the

flare parachute. To indicate the illumination projectile trajectory,

the ship will report "line of fire" followed by the directional

reference. The line of fire may be different from the GTL.

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(3) Ready/Time of Flight. When the ship is prepared to fire the

first salvo, the ship reports "ready" followed by the TOF (seconds

understood). The spotter reads back the entire prefiring report and

commands "break . . . fire." If the method of control included at

my command, the ship will also report "ready" before firing each

subsequent round. The ship will inform the spotter when there is a

TOF change of more than five seconds.

Example

Ship: "GTL 1680, ready 17, over."

Spotter: "GTL 1680, ready 17, break. . . fire, over."

(4) First Salvo at (Point of Aim). When the spotter has reported a

danger close situation, the ship confirms the point of aim that was

previously ordered by the spotter.

Example

"First salvo at north 400."

(5) Summit. If the spotter is airborne, the ship routinely reports the

highest altitude above mean sea level that the projectile will reach

on its flight path to the target. Summit may also be requested by

ground spotters or the NGLO. Summit is reported in feet to aerial

observers and in meters to ground units.

(6) Any Changes. If the ship must change any portion of the

spotter's fire request, the ship notifies the spotter of the change.

For instance, if the spotter requests "WP in effect" and the ship has
none remaining, the ship will announce "cannot comply with WP,

HE in effect."

f. Authentication. To avoid deception, the ship should initiate

authentication procedures on establishing initial communications

with the spotter.

3205. Report Upon Firing. The ship will transmit "shot" and

"splash" after each salvo is fired in adjustment and after the initial

salvo in the fire-for-effect phase. There is no requirement for the

spotter to acknowledge these transmissions.

a. Shot. Shot is transmitted at the moment the guns are fired.

b. Splash. Splash is transmitted five seconds before the round is

expected to detonate. Splash is not reported during fire for effect

when two or more ships are conducting a massed-fire mission. In

coordinated illumination missions, splash is reported for

illumination (star) shells before the beginning of the HE

adjustment phase and thereafter for the-HE round only.

Example

"Shot. . . splash, out."

3206. Correction of Errors. Errors are sometimes made by the

spotter or by the ship when transmitting data. The following

procedures should be used to correct the data.

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a. Correction. If the spotter realizes that he has made an error in

his transmission, he immediately transmits the word "correction"

followed by the corrected data. If the correction affects other

subelements, his correction includes a restatement of the entire

data.

Exam pie

'Correction, direction 0670, over."

b. Wrong. If an error is made during a readback, the word

"wrong" followed by the correct data is transmitted at the end of

the transmission. The word "wrong" is then read back, along with

the corrected version.

Example

"Wrong, direction 0670, right 300, add 400, up 15, over."

Section III. Adjustment of Fire

This section explains the procedures and the conditions for

adjustment of fire. After a round bursts, a spotting is made and a

correction is transmitted to adjust the fires onto the target. On

satisfactory adjustment, the observer enters the fire-for-effect

phase. This section is applicable to the artillery FO, the mortar FO,

and the NGF spotter. Except where addressed separately, the word

observer in the text refers to all three.
3301. Spottings. A spotting is an observer's mental determination

of the location of the burst or mean point of impact (MPI) of

multiple bursts in relation to the adjusting point as observed along

the OTL. Spottings are not normally announced except in

situations involving straddle NGF and observed/lost spottings.

Spottings must be made the instant that the burst occurs, except

where delayed deliberately to take advantage of drifting smoke or

dust. The observer should position his binoculars for spotting

before the burst appears. The observer holds the binoculars just

below eye level, looking over the top of them with the naked eye

until the burst is sighted. Then, the binoculars are raised to eye

level and the spotting is made. Spottings are made for height of

burst (HOB) to determine how high a burst is above the target, for

range to determine how far a burst is beyond or short of the target,

and for deviation to determine how far a burst is to the right or left

of the OTL. The observer should consider spotting in that order

(HOB, range, deviation) to determine the most difficult spottings

first.

a. Height-of-Burst Spottings. HOB spottings are used to

determine any increase or decrease required in the HOB or altitude

of impact of a round. HOB spottings are used for adjusting air

bursts when firing fuze time. These spottings are also used for

making adjustments to ground bursts when attacking a target on a

steep slope or with a vertical face. HOB spottings for air bursts are

made to the nearest mu by using binoculars. HOB spottings are

categorized as either air, graze, or mixed. These spottings are then

used to make HOB corrections.

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(1) Air. An air spotting is a round or group of rounds that burst in

the air. The observer measures the number of mils above the target

at which the air burst detonates. The spotting is made as air (so

many mils) above the target.

Example Air 12."

(2) Graze. A graze spotting is a round or group of rounds that

detonates or impacts. The spotting is made as graze.

(3) Mixed, Mixed Air, and Mixed Graze. A mixed spotting is a

group of rounds that results in an equal number of air bursts and

graze bursts. A mixed air spotting is a group of rounds that results

in air bursts and graze bursts when most of the bursts are air bursts.

A mixed graze spotting is a group of rounds that results in air

bursts and graze bursts when most of the bursts are graze bursts.

When attacking a target on a steep slope or with a vertical face,

HOB spottings for ground bursts are the difference between the

altitude (in meters) of the burst and the altitude of the target. The

observer determines the difference by visual estimation or by map

measurements. These spottings are then used to make HOB

corrections.

b. Range Spottings. Definite range spottings are required to make

a proper range adjustment. A graphical portrayal of range spottings

is shown in figure 3-8 on page 3-43. Normally, a burst on or near

the OIL provides a definite spotting. An observer can make a
definite range spotting when the burst is not on or near the OTL by

using his knowledge of the terrain, drifting smoke, and shadows.

However, even experienced observers must use caution and good

judgment when making such spottings. Possible range spottings

are over, short, target, range correct, and doubtful.

(1) Over. An over spotting is a round that detonates beyond the

target or adjusting point.

Figure 3-8. Range Spottings.

(2) Short. A short spotting is a round that detonates between the

observer and the target or adjusting point.

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(3) Target. A target spotting is a round that detonates on the target.

This spotting is used in precision fire (artillery or mortar

registration or destruction missions).

(4) Range Correct. A range correct spotting is a round that

impacts at the correct range.

(5) Doubtful. A doubtful spotting is a round that is so far to the

right or left of the OTL that a definite range spotting cannot be

made.

c. Straddle (Naval Gunfire). In NGF, a spotting of straddle is

made for a multigun salvo when some rounds fall short and some

fall beyond the target. The spotter announces "straddle" followed

by a correction to place the MPI on the target. The term is

normally used during a ship adjust or a massed-fire mission.

d. Deviation Spottings. Deviation spottings determine the angular

amount and direction of the deviation as seen from the observer's

position. Examples of deviation spottings are shown in figure 3-9

on page 3-45. During a fire mission, the observer measures

deviation to the nearest five mils (nearest mil for precision fire) by

using the method discussed in paragraph 2103. Possible deviation

spottings are line or (so many mils) right or left of the OTL.

e. Unobserved Spottings. Under certain conditions, the observer

may be able to make a spotting even though he is unable to see the

round impact. For instance, he may hear but not see the round

impact. By knowing the terrain, the observer determines that the
only place that the round could have impacted without being seen

is in a draw beyond the target. Although this is an unobserved

spotting, the observer can make adjustments from the location

where he determines that the round impacted.

Figure 3-9. Examples of Computing Deviation Spottings.

3-45

Deviation Spotting Line

Deviation Spotting 20 Left
3-46

1) Visibility Impairment. Visibility may be temporarily impaired

in situations in which the observer has to take cover from incoming

fire or smoke or dirt obstructs the target area visibility. The

observer may also be unable to make an accurate spotting because

he cannot determine which round among several is his round. In

any of these situations, he announces "repeat" to indicate his desire

for another round to be fired with the same data.

(2) Lost Rounds. If the observer is unable to locate the round

(either visually or by sound), the spotting is lost. This spotting is

announced followed by the appropriate corrective action. Rounds

may be lost for several reasons, including fuze malfunctioning

(dud), terrain or weather that prevents the observer from spotting

the round, or errors by the firing unit. When a round is lost,

positive action must be taken. In selecting the course of action, the

observer should consider his own experience, the firing unit's

proficiency as demonstrated on previous missions, and the location

of the friendly elements with respect to the target. Corrective

actions by the observer may consist of one or more of the

following:

• Begin with a data check of the target location data and the call

for fire.

• Request that the firing unit check their data. In NGF, the spotter

would announce "check solution."

• Request "repeat."
• Request shell WP, a 200-meter air burst with HE, or a smoke

round (artillery only) for the next adjustment.

• Make a bold shift. Ensure that friendly troops are not

endangered.

If the above corrective action fails, send "end of mission," and

transmit a new call for fire. See paragraph 3303. for procedures on

end of mission.

3302. Corrections. After spotting the burst, the observer

determines and transmits a correction (in meters) to move the next

round to be fired onto the target or adjusting point. Corrections are

sent in the reverse order of the spotting (deviation, range, and

HOB). The observer simultaneously corrects for deviation, range,

and HOB as required.

a. Sequence of Subsequent Corrections. After the initial burst

appears, the observer transmits subsequent corrections until the

mission is terminated. These corrections include appropriate

changes in elements that were previously transmitted and the

necessary corrections for deviation, range, and HOB. Table 3-1

provides a means for the observer to organize his transmission of

multiple corrections in an orderly flow. Of the possible corrections

in table 3-1 on page 3-49, the observer uses only those correction

that are required.

b. Direction. Direction is the key element for adjustment of

rounds. Direction precedes all other subsequent corrections when

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announced. In NGF, direction is sent as part of the call for fire. In

artillery/mortars, if direction is not included in the call for fire, it

can be sent immediately after the call for fire, while reading back

the MTO, or with the first subsequent correction. Refinement of or

changes to direction are made when the original direction changes

by 100 mils/five degrees or more. Elements that may require

correcting and the sequence of these corrections follow.

c. Deviation Corrections. Deviation corrections are determined in

the following manner.

(1) Step One. Determine deviation spotting to the nearest five mils

(one mil for precision fire).

(2) Step Two. Determine the UT factor. When the distance is

greater than 1,000 meters, the UT distance is determined to the

nearest 1,000 meters. The distance is then expressed in thousands

(drop the last two digits) as the UT factor. If the UT distance is less

than 1,000 meters, then the distance is determined to the nearest

100 meters and expressed in thousands.

(3) Step Three. Multiply the deviation spotting by the UT fictor.

Express to the nearest 10 meters. Deviation corrections are

transmitted in multiples of 10 (meters understood), with the

minimum correction being 30. The direction of the deviation

correction is opposite that of the spotting. The computed deviation

correction is announced as "left" or "right" (so much) (meters

understood). Table 3-2 on page 3-50 provides examples of how

deviation corrections are made.
Table 3-1. Sequence of Subsequent Corrections.

Artillery/Mortars NGF

Direction Direction

Danger close Danger close

Trajectory Trajectory

Method of fire Shell

Distribution Fuze

Shell Deviation1

Fuze' Range'

Volume of fire HOB'

Deviation' Number of guns

Range' Number of salvos

HOB' Method of control'

Target description

Change in type of mission/control'

Splash

Repeat'

Notes: 1These commands constitute a command for the firing unit to

deliver another round unless modified by the command "at my

command."

r Example

OT distance = 2,400 meters; OT factor = 2

OT distance = 800 meters; OT factor = .8

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Note

Large deviation corrections (e.g., right/left 400) may indicate an error in

direction. This could be attributed to errors in initial target location, improper

orientation of the OF fan, or malfunction of direction measuring equipment.

When large corrections occur, the observer makes an appropriate check by

verifying direction before continuing the mission. When necessary, he

refines and transmits the new OT direction. Accuracy of adjustments

depends, in part, on an accurate direction.

Table 3-2. Example of Computed Deviation Corrections.

Deviation

Example OT Distance (m) OT Factor Spotting Correctiou'i

1 4,000 4 45 right Left 180

2 2,500 2 100 left Right 200

3 3,400 3 55 left Right 160

4 1,500 2 20 right Left 40_—

5 700 0.7 45 left Right 30

d. Relationship of Observer-Target Line and Gun-Target Line

and Dispersion. The relationship of the OTL to the GTL may

influence the determination of deviation corrections. The natural

dispersion along the GTL (more pronounced with NGF) limits the

accuracy of some corrections. An observer whose OTL is

perpendicular to the GTL makes deviation corrections that are

actually range corrections for the weapons system. When this

happens, the observer can overcorrect by spotting and correcting

what is actually natural dispersion along the GTL.
(1) Artillery and Mortars. The angle formed by the intersection

of the OTL and the GTL with the vertex of the angle at the target

location is referred to as angle T. The observer is notified when

angle T is significant enough to affect the adjustment of fire (500

mils or greater). When notified, the observer continues to make his

deviation corrections as explained above. However, if he sees that

the corrections are not taking their proper effect (e.g., a right 200

correction appears to shift right 300), the observer may consider

adjusting his corrections proportionately to compensate for

dispersion resulting from angle T, for example, cut the correction

in half or thirds. (See figure 3-10 on page 3-52.)

(2) Naval Gunfire. The spotter must remain abreast of the

OTL/GTL relationship because the characteristic flat trajectory of

NGF results in a pronounced dispersion pattern along the GTL

(range dispersion). The spotter must derive the OTL/GTL

relationship from the prefiring report. He then visualizes the

OTL/GTL relationship. The adjustment of NGF is discussed in

detail in paragraph 3304.

e. Range Corrections. The observer must be aggressive in his

conduct of the adjustment. He should strive to enter fire for effect

as soon as possible. When conducting an adjustment onto a target,

the observer makes range corrections along the OTL. Range

corrections consist of the command "add" (move burst away from

the observer) or "drop" (move burst closer to the observer). Range

corrections are transmitted in multiples of 100 meters with the

smallest correction being 100 meters. However, 50-meter

corrections may be used when entering fire for effect. The methods

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for conducting range corrections are successive bracketing, hasty

bracketing, one-round adjustment, and creeping fire.

(1) Successive Bracketing. After a definite range spotting of over

or short has been determined, the observer selects a range

correction that is sufficiently large to ensure that the next round's

impact is on the opposite side of the target from the previous

round's impact. This essentially brackets the target between the

two rounds. The observer selects a correction of add or drop 100,

200, 400, or 800 (meters understood) to achieve a bracket. Once a

bracket has been established, corrections are made that

successively split the bracket in half in multiples of 100-meter

increments, always moving the next burst toward the target. The

observer continues this process until a 100-meter bracket is

Gun Posibon Observer Figure 3-10. AngIe T.
established around the target or adjusting point. He then adds (or

drops) 50 (with a deviation correction as required) and enters the

fire-for-effect phase.

Note

On missions when PER is greater than 38 meters or on missions using shell

dual-purpose improved conventional munitions (DPICM), M825, or family of

scatterable mines (FASCAM), the fire-for-effect phase is entered after a

200-meter bracket has been established.

In NGF, once a 200-meter bracket is achieved, the spotter may

enter fire for effect when engaging an area target such as a supply

depot. If the observer fails to achieve a bracket on his initial

correction, he retransmits another range correction until he

achieves a bracket. Successive bracketing procedures are time

consuming. This procedure should be used only when time is not

critical and the situation requires this type of adjustment.

Example

The observer's spotting for the first round is "over, 75 mils left.' Using an OT

factor of two (OT distance 2,400), the observer's first correction would be

"right 150, drop 200." The next spotting is "short, 15 mils right." The observer

transmits "left 30, add 100." The round impacts "short, five mils right." The

observer transmits "add 50, fire for effect." (No deviation corrections of less

than 30 am made.)

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Note

Large range corrections (e.g., add/drop 800) may indicate an error in the

initial OT factor calculated by the observer. By combining the initial distance

to target with subsequent range corrections, a new 01 factor can be refined.

Determine a new OT factor with bold range corrections. Accuracy in

adjustment depends on an accurate 01 factor.

(2) Hasty Bracketing. Experience has shown that effectiveness on

the target decreases as the number of rounds used in adjustment

increases. This is due to a loss of surprise. An alternative to

successive bracketing is hasty bracketing. In this technique, the

observer uses an initial bracket as a yardstick to determine a

correction necessary to move the next round(s) onto the target in

fire for effect. Hasty bracketing can achieve effective results

depending on the nature of the target, the terrain, the firing unit's

proficiency, and the observer's experience. However, hasty

bracketing is difficult to use when adjusting NGF because of its

characteristic dispersion pattern.

(3) One-Round Adjustment. Unlike the two adjustment

techniques discussed above, this method does not require the

establishment of a bracket. The observer spots the location of the

first round, calculates and transmits a correction that is necessary

to move the next burst onto the target, and fires for effect.

One-round adjustment requires an experienced observer w'ho is

familiar with the terrain. This technique can be used when

insufficient time exists for adjustment, when the observer is

equipped with a laser rangefinder, or when the continued

adjustment of fire may endanger the observer. The laser polar
technique uses a one-round adjustment because of the accuracy of

its measurements. (See paragraph 9016.)

(4) Creeping Fire. The creeping fire method of adjustment is used

when the observer desires to make range corrections by creeping

the rounds closer to the target instead of bracketing or large

corrections. This method of adjustment is always used in danger

close missions. In danger close situations, the observer must keep

in mind the position of the friendly troops to ensure that a

correction will not cause rounds to endanger them. This may be

applicable in situations where lost rounds are likely, for example,

adjusting onto a target located on the topographic crest of a hill.

(a) In artillery and mortars, the observer makes corrections for

creeping fire in 100-meter increments or less when moving rounds

toward friendly forces. All mortars that will fire for effect are used

in adjustment. For battalion missions, firing batteries should be

adjusted individually.

(b) In NOF, the spotter moves each round in creeping fire toward

the target in increments of 100 or 200 meters until effect is

obtained. The combined effect of the correction should not exceed

200 meters toward friendly forces. If more than one gun is to fire

for effect, the spotter should check the MPI of all guns to be used

before entering fire for effect. Fires may be crept to within a

minimum safety distance of the friendly position. Recommended

minimum safety distances for adjusting salvos of a five-inch gun

are 200 meters when firing parallel to front lines and 350 meters

when not firing parallel to the front lines. The ship will normally

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advise the spotter when the predicted fall of shot approaches the

minimum safety distances.

f. Height-of-Burst Corrections. HOB corrections are used to

adjust the difference in altitude between the impact of roundis and

the target. HOB corrections are also used to make corrections for

air bursts. (See paragraphs 3305. (artillery) and 3306. (naval

ire).) HOB corrections are needed when attacking a target on a

steep slope or for a target presenting a vertical face. The observer

uses up or down corrections (in meters) to move the impact of the

round. These corrections will allow the observer to get rounds on

target with fewer adjustments than would be needed when using

other corrections, that is, add/drop or right/left. When using

up/down corrections, the observer adjusts to the target; that is, he

does not bracket. (See figure 3-11.)

Figure 3-11. Examples of Corrections.

I —

Add Correction Up Correction
3303. Fire-for-Effect Phase

a. Conditions for Entering the Fire-for-Effect Phase. The

fire-for-effect phase is entered when the deviation, range, and HOB

(as applicable) are correct or if effective fire will result when the

range bracket is split.

(1) Artillery and Mortars. The observer enters the fire-for-effect

phase in the following situations:

• When an adjusting round has an effect on the target

• When splitting a 100-meter bracket

• When splitting a 200-meter bracket if notified by the FDC that

the PER is 38 meters or larger or when firing shell DPICM,

M825, or FASCAM.

(2) Naval Gunfire. The spotter enters fire for effect in the

following situations:

• When an adjusting round has an effect on the target

• When splitting a 100-meter bracket for a point target

• When splitting a 200-meter bracket for an area target.

b. Procedures for Entering the Fire-for-Effect Phase. The

fire-for-effect phase is entered in the following manner.

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3-58

(1) Artillery and Mortars. The observer announces "fire for

effect," preceded by any corrections.

Example

"Fire for effect, over" or "right 30, add 50, fire for effect, over."

(2) NavaL Gunfire. The spotter transmits a correction as required,

the number of guns if different from that used in adjustment or

stated in the call for fire, and the number of salvos then announces

"fire for effect."

Example

"Right 30, add 50, six salvos, fire for effect."

c. Procedures for Obtaining Additional Fire After Fire for

Effect. The observer analyzes the results of the fire for effect. The

situation may require additional rounds to be fired on the same

location or a different location.

(1) Repeat. For artillery and mortars, if additional fire is needed,

the observer announces "repeat." The term "repeat" indicates the

observer's desire to use the same volume of fire.

(2) Adjust the Mean Point of Impact of the Fires. If the location

of the fire needs to be moved to achieve satisfactory results, the

observer announces the appropriate corrections (refinement) and

"repeat" or reenters adjust fire.
Example

"Right 100, repeat, over."

"Add 400, adjust fire (spotter adjust for NGF), over."

For NGF, the spotter distributes the fire over an area target by

announcing "spreading fires," followed by a correction or repeat.

Example

"Spreading fires, right 100, repeat, over."

d. Refinement. Refinement is given for all missions. Refinement

is a term used in artillery to indicate a final correction to move the

center of impact to the adjusting point. This correction may be less

than 30 meters and is expressed to the nearest 10 meters.

Example

"Right 20, add 20."

e. End of Mission. On achieving the effects desired on the target,

the observer should transmit an end of mission statement to the

firing unit. Four items are needed in the end of mission statement:

refinement, record as target, end of mission, and surveillance

(RREMS).

(1) Refinement. In artillery, if fires have been inaccurate but have

produced sufficient results, the observer transmits a correction or

refinement to the FDC.

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3-60

Example

WRight 20, add 20, end of mission, RPG silenced, over."

(2) Record as Target. If the observer wants the target to be plotted

for future use, he announces "record as target."

(a) In artillery and mortars, the FDC applies the refinement,

conducts a replot when necessary, and announces the adjusted grid

to the target. The target number should be the same number

provided in the MTO.

(b) In NGF, the target number is assigned by the spotter.

Example

Record as target, target number AB 1250, over."

(3) End of Mission. "End of mission" followed by surveillance is

the last transmission in the course of the fire mission. Once it has

been announced, the mission is considered to be terminated.

(4) Surveillance. Surveillance should be brief but should provide

casualty andlor damage information as accurately as possible. This

requires the correct usage of the terms destroyed, neutralized, and

suppressed, as addressed in appendix A.
Example

"End of mission, BMP neutralized, estimate six casualties, over.'

"Right 20, add 20, record as target, end of mission, three trucks destroyed,

estimate 15 casualties, over."

3304. Naval Gunfire Adjustment Procedures. The flat trajectory

and high muzzle velocity of NGF make the adjustment of NGF

difficult, particularly on flat terrain. The spotter must use OF

procedures (discussed previously in this chapter), such as accurate

target location and bracketing. The spotter must also use the

following procedures.

a. Identify the Gun-Target Line. When notified of the GTL in

the prefiring report, the spotter must visualize its position in

relation to the target and his own position. This will provide the

basis for the spotter to identify round-to-round dispersion in

adjustment.

b. Be Aware of the Dispersion Pattern of Naval Gunfire. The

fall of shot of NGF can be described as a narrow, elongated pattern

as seen along the GTL. The size of the pattern varies with range.

For example, at 21,000 meters, the five-inch-gun mount will cause

a round-to-round dispersion pattern that is approximately 150

meters long and 50 meters wide. Figure 3-12 on page 3-62 displays

the NGF dispersion pattern.

c. Predict Each Fall of Shot Before Impact. While the ship is

determining firing data for the next round, the spotter should

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visualize the fall of shot based on his corrections. The spotter

compares the actual impact of the round with the predicted fall of

shot. Differences that occur along the GTL may indicate

round-to-round dispersion.

Figure 3-12. Naval Gunfire Dispersion Pattern.

d. Ignore Errors to the Fall of Shot Attributed to

Round-to-Round Dispersion. When a round has impacted

contrary to its predicted fall of shot due to dispersion, the spotter

makes a correction from its predicted point of impact instead of its

actual point of impact. This correction should result in the next fall

of shot impacting as predicted. It also keeps the spotter from

getting a ping-pong effect in adjustment. (See figure 3-13 on page

3-63.)

e. Correct From the Mean Point of Impact. The MPI is "the

point whose coordinates are the arithmetic means of the

coordinates of the separate points of impact/burst of a finite

number of projectiles fired or released at the same aiming point

under a given set of conditions." (Joint Pub 1-02) When

consecutive rounds impact differently from their predicted fall of

shot, the spotter should make a correction from the average or MPI

of the rounds. (See figure 3-14 on page 3-63.)
Figure 3-13. Example of Dispersion.

Figure 3-14. Adjustment of Mean Point of Impact.

f. Multiple Rounds in Adjustment. There may be times when the

spotter needs to adjust with multiple rounds, to fire multiple salvos

from a single gun, or to use multiple guns in adjustment. The

3-63

The spotter visualizes the GTL.

His first spotting is "Short. 35 mils

nghr (OT factor = 2). He transmits a correction of "Left 70, add

200." His predicted fall of shot is

"Over, on line (A)." The second

spotting is "Over, 25 mils left."

(The apparent error is along the

GTL) The spotter transmits a

correction of "Drop 100." The

third spotting impacts as predicted

"Short on line (B)." The spotter's

final correction is "Add 50, live

salvos, fire for effect."

The first spotting is "Short. 35 mils nght" (OT

factor = 2). The first correction is "Left 70, add

200. The predicted fall of shot is "Over, on

line (A)." The second spotting is "Over, 25 mils

left." ('The apparent error is along the GTL.)

The spotter transmits a correction of "Drop

100." The predicted fall of shot is "Short, on

line (B). The third spotting impacts "Short, '...—

30 mils left." The spotter notes that two

consecutive rounds have impacted "left" of

their predicted points of impact (A and B). The

final correction is "Right 50, add 50, five salvos,

fire for effect.' Note that the spotter made his

deviation correction from the MPI of the last

2 rounds (25 mils left and "30 mils left").
3-64

multiple-rounds-in-adjustment technique requires the spotter to

adjust from the MPI of all rounds fired. This technique is normally

used when firing on a large-area target or when visualizing the

GTL. This technique can also be used by spotters who are

experiencing difficulties in range dispersion during adjustment.

g. ElevationfHeight-of-Burst Adjustment of Impact Fires. On

steep terrain, up or down corrections are essential in the adjustment

of NGF. The spotter uses the corrections to bring the fall of shot to

the same elevation as the target. Up and down corrections will be

reflected on the ground with reference to the GTL. The spotter

transmits up or down corrections in increments of five meters. The

spotter can use the map to help determine these corrections. The

spotter should avoid mixing add or drop with up or down

corrections for impact fires because both of these corrections

involve an elevation change on the gun and the results would be

unpredictable. Deviation and range adjustments along the OTL will

usually equate to elevation changes on the gun when transformed

to GTL corrections. The spotter should use up or down corrections

to bring the impacts to the same altitude as the target then switch to

deviation andlor range corrections.

3305. Adjusting Artillery Air Bursts. Two types of fuzes that

create an air burst with shell HE are mechanical time fuzes, called

time, and proximity fuzes, called VT. When firing fuze time, the

FO must adjust the HOB. The adjustment of air bursts is made by

using HOB spottings to determine a correction. The firing battery

fires one gun in adjustment. VT fuzes do not require adjustment.
a. Time Fuze Procedures

(1) Adjustment. HOB adjustment follows the adjustment of HE/Q.

HE/Q is adjusted for deviation and range to within 50 meters of the

target. The FO then initiates the firing of an air burst by

announcing "time repeat" or "time . . . " followed by a deviation

andlor range correction. When an air burst detonates, the HOB

spotting (to the nearest mu) is multiplied by the OT factor to

determine a correction in meters. The correction is made to cause

the next air burst to detonate 20 meters above the target. The

correction is transmitted as an up or down correction followed by

the number of meters (understood to be meters). Deviation or range

corrections are not made after entering the time phase.

(a) Graze Burst. If the initial round is a graze spotting, then an

automatic correction of "up 40" is made. Subsequent "up 40"

corrections are given until an air burst is achieved. Consecutive

graze spottings may indicate an error by the battery, for example,

improper fuze setting, or an error by the observer in target location

altitude. The FO must avoid making deviation and range

corrections from a graze burst unless he is unable to achieve effects

on target.

(b) Corrections. When making HOB corrections, the FO must be

aware of the gunnery solution and its effect on the round. (See

figure 3-15 on page 3-66.) When a HOB correction is given by the

FO, the FDC converts the HOB correction to a fuze setting

correction for the mechanical time fuze. An up HOB correction

will result in a decrease in the fuze setting; a down correction will

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3-66

result in an increase in the fuze setting. The change in fuze setting

will change the point of detonation along the trajectory of the

round. In addition to achieving a change in HOB, the FO will also

see a change in range. An up correction will result in the round

detonating short of the target; a down correction will result in the

round detonating closer to the target.

Figure 3-15. Effect of Height of Burst Corrections on Burst of

Round.

(2) Fire for Effect. When an air burst is achieved, the

fire-for-effect phase is entered if the FO believes that the HOB

correction will result in a 20-meter HOB. Fire for effect is never

Air Burst at 21.0 Seconds

(After iJp Correction)

Air Burst at 21.2 Seconds

(Before Up Correction) .

I I.

Change in Range Because of Up Correction
begun if the last round observed was spotted as "graze" or if the

HOB correction is greater than 40 meters.

Example

"Down 10, fire for effect, over."

There are several possible spottings for the initial fire-for-effect

volley, including air, mixed, mixed air, and mixed graze. (See

paragraph 3301.) If additional fire, or sending refinements, is

required to achieve effects, the following corrections can be made.

For air, adjust the mean HOB to 20 meters. For mixed, the

correction is "up 10." For mixed air, the HOB is correct. For mixed

graze, the correction is "up 20."

(3) Fire-for-Effect Missions. Time fuzes are normally selected for

adjust-fire missions because of the requirements to achieve an

effective HOB. However, it is possible to initially fire for effect

with time fuzes if a registration has been conducted with that faze

lot. The closer the target is to the registration point, the greater the

likelihood of achieving effects without adjustment.

b. Proximity Time Fuze Procedures

(1) Adjustment. VT fuzes require no adjustment before firing for

effect. The fire-for-effect phase is entered after the appropriate

bracket is established with the adjusting shell and fuze. VT fuzes

should always achieve an air burst.

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(2) Fire for Effect. VT fuzes achieve their seven-meter HOB by

using radar, not the time setting on the fuze. Graze bursts of an

entire volley indicate either a computational error by the battery,

for example, improper fuze setting; an error by the observer in

target location altitude; or a malfunctioning lot of fuzes. In the case

of graze bursts with VT, the spotting of graze is transmitted to the

FDC.

Example

uGraze repeat, over."

The FDC then subtracts one second from the fuze arming time in

an attempt to overcome computational or observer error. Factors

affecting the performance of VT fuzes and possibly creating

premature air bursts include snow, water, and intervening crests.

3306. Adjusting Naval Gunfire Air Bursts. Time fires use

special fuzes to achieve an air burst over the target. These fuzes

include mechanical and electronic time fuzes that require a time

setting before firing. Air bursts may also be delivered by proximity

fuzes (VT and fuze controlled variable time (CVT)) designed to

explode at an optimal HOB (20 meters for five-inch NGF) based

on a radio-activated signal. Time fires using time or electronic time

fuzes require adjustment to ensure detonation at an optimal HOB

(20 meters) in fire for effect. Proximity fuzes do not require

adjustment.
a. Adjustment of Time Fires. The observer announces "fuze time

in effect" in the method-of-engagement element of his call for fire.

He conducts adjustment with fuze quick in the same manner as

discussed previously in this chapter. He enters the time phase of

the adjustment process in the following situations:

• When splitting a 200-meter bracket for an area target

• When splitting a 100-meter bracket for a point target

• When an adjusting round has an effect on the target.

The transmission to enter into the time phase of adjustment is "fuze

time" followed by a correction (or repeat).

Examples

"Fuze time, right 30, add 50, over."

"Fuze time, repeat, over."

b. Height-of-Burst Corrections. If the initial time round is

spotted as a graze, then the correction is "up 40." A 40-meter HOB

correction will be applied until a spotting of "air" is obtained.

Consecutive graze spottings may indicate an error in the altitude of

the target reported in the call for fire or an error by the mechanical

fuze setter on the gun. The spotter must avoid making deviation

and range corrections from a graze burst. Usually, a graze burst

will be over the target on the GTL. Once an initial air spotting is

achieved, the spotter measures the spotting to the nearest mu and

computes a HOB correction by multiplying the spotting by the OT

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factor. The HOB correction is made to the nearest five meters to

correct the HOB to 20 meters. If a correct HOB can reasonably be

expected, the spotter enters fire for effect. If the air spotting is

excessively high (60 meters or greater), then the spotter should

observe another salvo before entering fire for effect. Excessively

high bursts are normally short on the GTL and out of the target

area because the fuze functioned prematurely in the projectile's

trajectory. If a graze burst is obtained after an air burst, the

correction is "up 20." Fire for effect is never begun when the last

burst observed results in a graze spotting.
Chapter 4

Requesting and Controlling Close Air Support

This chapter provides procedures for requesting and controlling

both fixed- and rotary-wing CAS. Normally, the terminal control

of CAS aircraft is conducted by FACs. However, in combat or

emergency situations where a FAC is not available, other Marines

who are knowledgeable of these procedures, particularly observers

and spotters, may request CAS and function as the terminal

controllers for CAS aircraft. An understanding of these procedures

by observers and spotters also enhances the coordination of

missions that integrate indirect fires and CAS. Because these

procedures are applied by all Marines requesting or controlling CAS, including Marines who are not formally trained or

designated as FACs, this chapter will refer to the CAS requester

and controller generically as the terminal controller. The CAS

procedures discussed here are oriented to high-threat conditions

because these are the most difficult to understand and the most

demanding that may be encountered in the battlespace. In lower

threat situations, these procedures may be streamlined. More

detailed discussion of CAS terminal control procedures can be

found in MCWP 3-23.1.

4001. Types of Close Air Support. There are two types of CAS

that are available to support the ground forces: preplanned and

immediate. The type used depends on the time available for

planning.

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4-2

a. Preplanned. Preplanned CAS is an airstrike on a target that can

be anticipated sufficiently in advance to permit detailed mission

coordination and planning. These missions are categorized as

scheduled or on call. A scheduled mission is executed at a specific

time. An on-call mission involves aircraft placed in a ground/air

alert status and preloaded with ordnance for a particular target or

type of target.

b. Immediate. Immediate CAS is an airstrike on a target of

opportunity that was not identified or requested sufficiently in

advance to permit detailed mission coordination or planning. An

immediate mission is the type with which the observer and the

spotter will commonly be involved, and it requires impromptu

coordination.

4002. Levels of Threat. The employment of CAS will likely be

against an enemy who presents an air defense threat. This threat

will affect the employment of CAS. The feasibility of using CAS

on a specific target will be driven, in part, by the threat. Attack

tactics selected by the aircraft pilot or flight leader will be

influenced by the threat. Attack tactics are the specific tactics used

in attacking a target. The greater the threat, the lower the altitude;

the higher the dive angle, the more accurate the delivery. The

threat to CAS may be high, medium, or low.

a. High Threat. A high threat is an environment created by a

hostile force massing heavy combat power, including an Integrated

Air Defense System (lADS) and electronic warfare capabilities that

would seriously diminish the ability of the ACE to provide
necessary air support. In this type of threat, aircraft tactics are

normally characterized as fast and low. This results in a minimal

time for target acquisition, which may affect accuracy.

b. Medium Threat. A medium threat is an environment in which

the enemy possesses a limited radar/electro-optical acquisition air

defense system that is not filly integrated. Specific aircraft

performance and associated weapons systems permit tactics that

allow acceptable exposure to those enemy defenses.

c. Low Threat. A low threat is an environment where no known

integratedlsophisticated surface-to-air or air-to-air capability exists.

The threat is limited to visual target acquisition and fire control

systems, that is, small arms, large-caliber automatic weapons, and

shoulder-fired infrared missiles. In this type of threat, aircraft

tactics may be fast or slow, at low to medium altitude, with ample

time to acquire the target.

4003. Airspace Control Measures. Airspace control measures are

procedural control measures designed to maximize the

effectiveness of combat operations by promoting the safe, efficient,

and flexible use of airspace. Airspace control measures are used to

delineate or modify hostile criteria, delegate target identification

authority, or serve as aids for fire control. Airspace control

measures speed handling and control of aircraft over the

battlespace. Air control agencies such as the DASC or Navy TACC

use these measures in directing aircraft to and from the target area.

Terminal controllers and observers must understand the meaning

of each of these measures.

4-3
4-4

a. Control Point. Control points route aircrews to their targets and

provide a ready means of conducting fire support coordination.

Control points must be easily identified from the air and support

the MAGTF's scheme of maneuver. The MAGTF force fires

coordination center (FFCC) and the ACE select control points

based on MAGTF requirements. The MAGTF commander

approves control points. Control points are given names or

numbers and are often used to facilitate the establishment of

airspace coordination areas (ACAs) for aircraft operating in areas

where flight routes or tactics can conflict with indirect-fire

trajectories.

b. Contact Point. A contact point is the position at which an

aircrew makes radio contact with an air control agency. Normally,

a contact point is outside the range of enemy surface-to-air

weapons. The aircrew contacts the terminal controller at the

contact point during ingress. A contact point allows coordination

of final plans before heavily defended airspace is entered.

c. Initial Point. Aircrews use an initial point (IF) to start their run

to the target or their approach to a landing zone. IPs are well

defined and easily identified (visually or electronically). Terminal

controllers and aircrews use IPs to help position fixed-wing CAS

aircraft delivering ordnance.

d. Holding Area. Holding areas are areas well forward in the

battlespace that provide for helicopter dispersion as well as cover

and concealment from enemy observation and fires. Holding areas

may be located at maneuver regimental or battalion headquarters or
at the terminal controller's position. Rotary-wing CAS aircrews

normally occupy holding areas while awaiting targets or missions.

While in the holding area, rotary-wing CAS aircrews receive CAS

briefmgs and perform final mission coordination with terminal

controllers.

e. Battle Position. Battle positions are maneuvering areas that also

contain various firing points, both laterally and in depth.

Helicopters maneuver in battle positions while awaiting the TOT

or time to target (TTT). They are coordinated and selected by the

supported commander. Once the terminal controller clears

rotary-wing CAS aircraft into a battle position, these aircraft

should not exit until authorized. Aircrews have freedom of

movement within the battle position unless restricted by the flight

leader. To avoid enemy counterfire, aircraft may need to displace

and resume the attack from a different battle position. Therefore,

alternate battle positions should be established. Terminal

controllers should consider requesting ACAs around battle

positions. If an approved battle position does not exist, aircrews

can plan a hasty battle position in coordination with the terminal

controller. If there is not a properly placed or existing battle

position, the terminal controller may create a new battle position.

Terminal controllers identify the battle position by grid, known

point, or prominent terrain or by shifting an existing battle

position. The positions of new battle positions must be given to the

appropriate FSCC for fire support coordination. Battle position

selection is based on the following factors.

4-5
4-6

(1) Field of Fire. The battle position should permit the sighting of

targets throughout the kill zone.

(2) Adequate Maneuver Area. The battle position must be large

enough for rotary-wing CAS aircrews to maneuver between

various firing points.

(3) Range. The battle position should be located so that the kill

zone is within the effective range of rotary-wing CAS aircraft.

(4) Target Altitude. The battle position should be at an elevation

equal to or higher than the target area.

(5) Background. Terrain features behind the battle position should

prevent rotary-wing CAS aircraft from being silhouetted against

the horizon.

(6) Sun/Moon. If possible, the sun or moon should be located

behind or to the side of the aircraft. This allows the rotary-wing

CAS aircrews to view the kill zone and prevents the enemy from

seeing and targeting the aircraft.

(7) Shadow. If possible, terrain or vegetation should cover the

battle position with shadows.

(8) Rotor Wash. The battle position location should reduce the

effects of rotor wash on surrounding terrain, for example, debris,

leaves, snow, sand, and dirt.
(9) Backblast. The battle position location should reduce the

effects of backblast on surrounding terrain.

4004. Coordination Techniques

a. Run-In Heading. The run-in heading is the heading from the IP

to the target. For rotary-wing CAS aircraft, this may be the heading

from the center of the battle position to the target. The terminal

controller determines this heading from his map and converts it to

a magnetic heading for transmission in the brief. The assignment of

run-in headings facilitates fire support coordination by establishing

a corridor for the aircraft between the IP and the target. Without a

run-in heading, the aircrews may exercise a number of options for

proceeding from the IP to the target. The decision to use run-in

headings depends on factors such as target orientation, terrain,

disposition of defense, and weather.

b. Offset Direction. An offset direction is used to ease fire support

coordination, safeguard friendly forces, aid target acquisition, or

align aircraft for the attack or egress. The offset direction tells the

aircrew on which side of the IP-to-target line they can maneuver

for the attack. An offset direction aids fire support coordination by

restricting aircrews from using airspace on the other side of the

IP-to-target line. It keeps aircraft clear of enemy air defenses and

reduces interference with GTLs. It also reduces an aircrew's

chance of being hit by friendly direct and indirect fires.

4-7
4-8

Note

During combat, the danger to aircraft from friendly direct/indirect fires is quite

small compared to the threat from enemy air defenses. The offset direction

regulates the attack quadrant without assigning a specific attack heading.

This technique protects friendly ground forces from range errors in the

delivery of ordnance without unduly restricting the attacking aircraft.

c. Attack Heading. An attack heading is the assigned magnetic

compass heading that an aircrew flies during the ordnance-delivery

phase of the attack. Terminal controllers assign attack headings for

several reasons: to improve ground troop safety, to aid in target

acquisition, and to ease fire support coordination. Attack headings,

especially during visual attacks, may reduce the flexibility and

survivability of aircraft.

d. Pullup Point. The pullup point is important in low-level attacks

because it is the point at which the fixed-wing CAS aircraft begins

to climb to identify the target and to gain altitude to strike the

target. Pullup points are selected by the pilot and will vary

depending on the type of aircraft, type of attack intended, and

experience of the aircrew.

e. Attack Routes. Rotary-wing CAS aircrews use attack routes to

move from the holding area to the battle position. Aircrews select

primary and alternate attack routes. If an ACA is required, the

aircrew or terminal controller coordinates with the appropriate

FSCC. The ideal attack route is a corridor that allows aircrews to

move into the battle position undetected. Detection, even if beyond

the range of enemy air defense weapons, removes the advantage of
surprise. Terrain and vegetation are used to conceal aircraft

movement on the attack route. SEAD fires may also be employed

to conceal aircraft movement and, prevent detection.

f. Firing Points. A firing point is a specific point within a battle

position that a single aircraft occupies while engaging targets. The

flight leader determines movement of aircraft within the battle

position. Aircrews choose their own firing points even though the

supported commander coordinates and controls the location of the

battle position. Alternate firing points should be identified so that

aircrews can displace after the initial engagement.

4005. Aircraft Ordnance. A knowledge of aircraft ordnance is

important for the proper employment of CAS. This information

allows the terminal controller to know the effects that can be

produced on the target and to make target marking and airspace

coordination compatible with the type of delivery.

a. General-Purpose Bombs. General-purpose, MK-80-series

bombs are among the most widely used weapons in the inventory.

When fuzed for instantaneous detonation, they provide good

fragmentation effects for use against personnel and light

equipment. When fuzed for delayed detonation, they can be used to

create obstacles (e.g., cratering rounds). Retarding devices, called

snake-eye fins and ballute, can be attached to MK-82-series and

MK-83-series bombs. With these devices, it is possible to deliver

ordnance in a low-altitude delivery. (See table 4-1 on page 4-10.)

4-9
4-10

Table 4-1. Designations for General-Purpose Bombs.

Type Size Delivery Means

MK-82 aircraft 500 lb All fixed-wing CAS aircraft

MK-83 aircraft 1,000 lb All fixed-wing CAS aircraft

MK-84 aircraft 2,000 lb All fixed-wing CAS aircraft (except AV-8B)

The fragmentation pattern varies with the size, configuration, and

method of delivery of the bomb. An MK-82 with snake-eye fins

(delivered by an F/A-18 at 2,500 feet above ground level with a

release angle of 30 degrees) can produce a ground pattern with

fragments dispersed up to 1,000 meters on either side of the point

of impact. See appendix A for minimum safe distances.

b. Firebombs. The MK-77 is the primary firebomb. Firebombs

have a very erratic trajectory and must be released at a very low

altitude to achieve desired accuracy. A typical ground pattern for

the MK-77 is elliptical in shape and is approximately 215 feet long

in the direction of delivery and 75 feet wide. This ordnance can be

delivered from all CAS aircraft.

c. Cluster Bomb Unit Weapons. The cluster bomb unit (CBU)

weapon consists of one type of bomb casing filled with a large

number of either antipersonnel, antimateriel, or antitank munitions.

The CBU weapon is designed to provide a high kill or damage

probability against area, moving, and point targets. CBU weapons

can be employed from all CAS aircraft. The CBU weapon

inventory includes the following.
(1) MK-20 Rockeye. This is an area weapon designed for

antiarmor use. It can also be used against other targets, such as

trucks, missile sites, radars, and fuel storage tanks.

(2) CBU-591B Antipersonnel/Antimaterial Weapon. This

weapon is highly effective against both personnel and lightly

armored equipment under a wide variety of terrain conditions. The

bomblets function as shaped-charge devices against light to

medium armor and as fragmentation devices against soft targets.

Antipersonnel/antimaterial (APAM) weapons are highly effective

against parked trucks, armored personnel carriers, and so on.

(3) CBU-781B Gator. Gator provides a means for rapidly planting

a minefield. The mines are extremely effective against armored

vehicles and personnel for area denial and harassment. The ability

to select from three self-destruction times for the mines allows

tactical counterattack by friendly forces.

d. Rockets. There are two types of air-to-surface rockets in the

Marine Corps inventory—the 2.75-inch folding-fin aircraft rocket

(FFAR) and the 5-inch Zuni rocket. These rockets, with the

selection of warheads available, provide an effective attack against

a variety of targets. Rockets can be employed from all CAS

aircraft.

(1) 2.75-inch Folding-Fin Aircraft Rocket. These rockets are

normally fired in ripple (rapid repeat); this increases the probability

of hits. The warheads available are fragmentation, antiarmor

shaped charge, smoke, flare, and flechette.

4-11
4-12

(2) 5-inch Zuni. These rockets can be fired singly or in ripple,

with fragmentation, antiarmor shaped charge, or WP warheads.

e. Air-to-Surface Guided Missiles. Various air-to-surface missiles

are available in the CAS inventory. Some ofthese are discussed

below. Laser-guided missiles are discussed in chapter 9.

(1) Walleye Weapons System. Walleye is an air-to-surface glide

bomb that uses automatic video tracking for homing and guidance

to surface targets. This weapon is most effective against heavily

structured, well-defined targets in daylight/clear weather

conditions. Walleye can be employed from all fixed-wing CAS

aircraft except the AV-8B.

(2) M-65 Airborne Tube Launched, Optically Tracked, Wire

Command Link Guided Missile System. This weapon provides

the capability to conduct a point target attack of armor at a

maximum effective range of 3,750 meters. It is employed from

attack helicopters.

(3) AGM-1 14B Helicopterborne Fire and Forget Missile. The

helicopterborne fire and forget missile (HELLFIRE) is a

laser-guided antiarmor missile. It provides pinpoint accuracy from

a safe standoff distance. HELLFIRE can currently be employed

only from the AH-1W, AH-64, and OH-58D.

(4) AGM-65 Maverick Missile. The Maverick missile is used

against field fortifications and armored vehicles. There is a

laser-guided variant (AGM-65E) and an imaging infrared-seeker
variant (AGM-65F). The Maverick is employed from the F/A-18

and AV-8B.

f. Fuel Air Explosive Weapons. The HE force of the fuel air

explosive weapon creates an overpressure that can be effective

against mines, boobytraps, and personnel. The bombs are

parachute retarded and have a degree of target discrimination that

allows them to penetrate light foliage without detonation. This

ordnance can be employed from all CAS aircraft.

g. Guns. Aircraft employ various guns, including the 20-mm,

25-mm, and 30-mm weapons. Aircraft guns are accurate and

highly effective against a variety of linear targets, such as truck

convoys, a column of troops, and so on. All CAS aircraft can

employ guns.

h. Flares. All CAS aircraft can employ flares (MK-45/LUU-2),

which provide illumination of the target area for up to three

minutes (flare dependent).

4006. Close Air Support Request and Control Procedures. The

terminal controller normally follows a sequence of events that will

provide the essential information needed by those who must

approve the mission, coordinate the mission, and fly the mission.

The sequence of events is as follows: request, brief, time, mark,

adjust, control, and report.

4007. Request. Requests for immediate CAS missions are made to

support requirements that arise during battle and that cannot be

4-13
4-14

identified far enough in advance to permit detailed mission

coordination and planning. Immediate missions provide crisis

response to unforeseen dilemmas and sacrifice detailed planning

and tailored ordnance loads in return for timely response. Requests

for immediate CAS are normally transmitted on the TAR net by

the requester directly to the air control agency (normally the

DASC). The air officers at intermediate-echelon FSCCs monitor

the requests for coordination purposes and indicate approval in the

method prescribed by the commander—either positive or passive

clearance. The format used for immediate requests corresponds to

the appropriate lines of the joint tactical airstrike request (JTAR).

(See figure 4-1 on pages 4-16 and 4-17 and MCWP 3-23.1.) The

request may be made in one transmission or in separate bursts,

consistent with the communications security situation, and should

include pertinent lines from the JTAR. Requests for preplanned

CAS missions are submitted by using the same JTAR format but

are submitted to the appropriate FSCC for consolidation, approval,

and forwarding to higher echelon FSCCs.

a. Elements of the Immediate Request

(1) Identification of Unit Called/Requester. This element

includes the call signs of the unit called and the requester, followed

by the words "immediate CAS." The transmission of "immediate

CAS" prioritizes the mission for responsiveness.

(2) Mission Category. The mission category for an immediate

CAS mission is indicated by announcing "immediate" and the
mission priority. The following numerical designations are used to

define the tactical situation.

(a) 1—Emergency. Targets that require immediate action and

supersede all other categories of mission priority.

(b) 2—Priority. Targets that require immediate action and

supersede routine targets.

(c) 3—Routine. Targets of opportunity that do not demand urgent

execution.

(3) Target Description. The target is described by type, size, and mobility. This information is used in mission processing to

determine the type and number of aircraft and type and amount of

ordnance needed for the mission.

(4) Target Location. The target location is provided by using the

UTM 100,000-meter-square designation and grid coordinates (e.g.,

SS623 456) and the elevation in feet (mean sea level). The

ordnance delivery systems of F-14, F/A-18A, older model F/A-18C, and some U.S. Air Force aircraft require

latitude/longitude rather than UTM grid. (See appendix F.) Although all pilots can manually convert UTM grid to

latitude/longitude if necessary, it is generally easier for a trained

terminal controller to make this conversion. Pilots who are

distracted by threat conditions or other flight requirements may

specifically request latitude/longitude if a UTM grid is given. (See

figure 4-2 on page 4-18.)

4-15
4-16

JOINT TACTiCAL AIR STRIKE REQUEST S.e JCS Pub 12. Vol II. l slucdos for SECTION I - MISSION REQUEST DATE

I. UNIT CALLED THIS IS REQUEST NUMBER SEHT

TiME BY PREPS.ANNEO: j PRECEDENCE fi PRIORITY______________

2. IMMEDIATE: PRIORITY___________ RECE WED

TIME BY

TARGET ISiNUMBER OF PERS IN OPEN_._ 11 PERS DUG IN WPNSIMGIRRJAT_ f1 MORTARS.ARY_..._.

AM ADA ________ Fl RKTS MISSILE ARMOR VEHICLES

BLOGS j BRIDGES PILLBOX.BIJM<ER — SIJPPLIES.EQUIP_

j CENTER (CP.COM)__ J AREA ROUTE MOW4G N ES W_

0! REMARKS

TARGET LOCATION IS CHECKED BY

(COORDINATES) (COORDINATES) (COORDINATES) (COORDINATES)

ITGT ELEV— [SMEET NO— ..9JSERIES [ECHART NO—

- TARGET T1MEII)ATE

:AASAP LL'NLT iAT LTO

DESIRED ORb/RESULTS JORDNANCE

6. DESTROY— CNEUTRA1JZE— 2JNARASSENTERDICT

FINAL CONTROL A FACIRABFAC_ LL.CALL SIGN iFREo

OASRT E FREG LJPIX/CONT PT

B. REMARKS

1. IF___________________________________________

2. ONO ______________ NAG OFFSET IJR

3. 0TAE ________________________________________

4. TOT OI.EVATION _____________________________ FEET N. 2. TOT DESCRIPTION ___________________________

& TOT LOCATION ________________________________

7. MARK lIVE -__________________________ COOE — ______________________

L FRIENCUES ACKNOW1EDGED

io 901.101 8CM GRID_ BOE/REGT

I,, 909.101 NETSAS TOTGRIO..._... DMSION

'2. 901 E&EVATION ________________________FEET OThER Figure 4-1. Joint Tactical Airstrike Request (Section I).
SECTION lI-COORDINATION

9. NOF 10. AY 11. AIO/G-21G3

12. REQUEST 13. BY APPROVED El DISAPPROVED

14. REASON FOR DISAPPROVAL

15. RESTRICTIVE FiRE/AIR PLAN

IS NOT LJ NUER

IS. IS IN EFFECT

[](FROM TIME) [(TO TIME) 17. LOCATION

(FROM COORDINATE) [___ (TO COORDINATE)

18. WIDTh (IETERS) 19. ALTrT1JDENERTEX MAXIMUM VERTEX MINIMUM

SECTION II - MISSION DATA

20. MISSION NUMBER 21. CALL SIGN 22. NO. AND VfPE AIRCRAFT 23. ORDNANCE

24. ESTIACT TAKOFF 2S. 0S1 TOT 26 CONT PTIRDI1VS (COORD

NAVAID FiX) 27. INITIAL CONTACT

28. FAC/ASRT/TAC (A) CALL SIGN FREQ

29. RESTRICTIVE PIREJAIR

PLAN (SEE 15-19) 30. TOT DESCRIPTION II. TOT COORD/ELEV

32. BATTLE DAMAGE ASSESSMENT (BOA) REPORT

TARGET COORO

iiTlME ONFF

CI % ORO ON TGTI % TOT DESTROYED_______

ID IRE SULTS

[UNIT SUPPORTED

ACKNOWLEDGED

BOE/REGT

i DIVISION OThER

TRANSMIT AS APPROPRIATE Figure 4-1. Joint Tactical Airstrike Request (Section II).

4-17
4-18

Transmission:

Terminal controller: "Budworth, this is Tiger 14 with an immediate CAS

request, over."

Terrynnal controller: immediate, priority 2, five armored vehicles moving in

column, SS623 546, elevation 55, ASAP, Tiger 14,

Orange, Chevy, friendly troops 1,000 meters south,

over."

Description of Transmission:

Unit called/request identification Budworth, this is Tiger 14 with an

immediate CAS request, over.

Mission category Immediate, priority 2

Target description Five armored vehicles moving in

column

Target location SS623 546, elevation 55

TOT As soon as possible (ASAP)

Desired ordnance/results (Not normally transmitted)

Final control

Call sign Tiger 14

Frequency Orange

Contact point Chevy

Remarks Friendly troops 1,000 meters south,

over.

Figure 4-2. Example of Immediate Request.

(5) Time on Target. The time at which the ordnance is desired on

the target may be specified as "ASAP" (meaning that the target is

to be attacked as soon as possible); as "TOT NLT _______

(meaning that the target is to be attacked no later than (NLT) the

specified time on a synchronized clock); or as "TOT _______
(which provides a specified time on a synchronized clock when the

target is to be attacked).

(6) Desired Ordnance/Results. This element is not normally

transmitted in the immediate request because responsiveness

overrides ordnance selection.

(7) Final Control. This element identifies the terminal controller

who will conduct the attack briefing and control the release of

ordnance. It includes the call sign of the terminal controller, the

frequency recommended for terminal control, and the contact point

or IP to be used. The frequency is normally transmitted by using a

preestablished color code pertaining to a selected frequency. The

frequency modulation (FM) may be ultrahigh frequency (UHF) or

VHF, depending on the type of aircraft.

(8) Remarks. This element provides any additional information

that may assist the air control agency in mission processing, for

example, friendly location, weather, threats, and so on.

b. Processing and Routing of the Request

(1) Mission Clearance. The air officers at intermediate-echelon

FSCCs monitor requests for immediate CAS missions for

coordination purposes. Mission clearance is conducted in the

method prescribed by the commander—either positive or passive

clearance. Under positive clearance procedures, each request for

immediate CAS must be specifically cleared by the FSCC of the

unit in whose zone of action the fires will impact. The FSCC with

4-19
4-20

which the DASC is collocated must advise the DASC that the

mission is approved or disapproved before final mission processing

is completed and control of CAS aircraft is passed to the terminal

controller.

Under passive clearance procedures, FSCCs monitor the

transmitted CAS request and either remain silent if the request is.

cleared (silence is consent) or interject if the request is not cleared

or if more time is required to clear the request. In this case, the

DASC processes the mission request unless the FSCC with which

the DASC is collocated disapproves the request for immediate

CAS. To avoid inadvertent clearance resulting from loss of

communications, commanders may modify passive clearance

procedures by stipulating that immediate CAS requests are not

cleared unless the appropriate FSCCs acknowledge that the request

was monitored. For purposes of confirmation or when doubt exists,

the DASC will coordinate with the air officer in the FSCC with

which the DASC is collocated. Requests for CAS beyond the fire

support coordination line (FSCL) need not be cleared, but FSCCs

must inform all other affected units (e.g., special operations forces

and reconnaissance units) of these missions in sufficient time to

allow necessary reaction to avoid friendly casualties. In

exceptional circumstances, the inability to do so will not preclude

the attack of targets beyond the FSCL by CAS aircraft; however,

failure to coordinate these missions increases the risk of friendly

casualties and could waste limited resources through duplicative

attack. The MAGTF FSCC will establish procedures for

exchanging this information with other components of a joint

force.
(2) Mission Processing. The DASC begins processing immediate

CAS requests on receipt. It completes mission processing upon

receiving clearance from the FSCC with which it is collocated.

Clearance may be either positive or passive as designated by the

commander. After examining assets and priorities and coordinating

with the TACC as required, the DASC identifies what aircraft are

available for the mission. The aircraft assigned may come from

multiple sources, including ground alert aircraft, airborne alert

aircraft, or, if required, aircraft diverted from another mission. The

aircrew(s) will be provided with the final control data. The DASC

keeps the CAS requester informed of the status of the aircraft

filling his request. The DASC will assign a request number for the

mission. Figure 4-3 on page 4-22 gives an example of a

transmission by the DASC informing the terminal controller of the

mission status.

(3) Procedural Control. Procedural control of assigned aircraft

will be provided by the DASC to a point at which control will be

assumed by the terminal controller. The DASC determines aircraft

routing in coordination with the senior ground combat element

(GCE) FSCC on the basis of the tactical situation and the threat.

Aircraft are normally routed by using preestablished control points

throughout the area. The terminal controller will provide routing

for the aircraft from the point at which initial contact is made with

the aircraft.

(4) Initial Contact. Initial contact with the terminal controller will

be initiated by the aircraft on the assigned frequency. An example

of this initial contact is provided in figure 4-4 on page 4-23.

4-21
4-22

Transmission:

DASC: "Tiger 14, this is Budworth, mission 10-2, Check, two F/A-18s

inbound with Rockeye ETA 15, contact on Orange."

Description of Transmission:

Identification Tiger 14, this is Budworth

Request number Mission 10-2

Call sign of flight1 Check

Wumber of aircraft Two FIA-18s inbound

Type of ordnance Rockeye

Estimated time of ETA 15

arrival (ETA) in

minutes

Frequency of Contact on Orange

terminal control

Legend: 1The aircraft flight is referred to collectively by call sign; individual

aircraft in the flight are referred to as lead" (flight leader) and 'dash (number)"

(remaining aircraft in flight), for example, "dash 2."

Figure 4-3. Example of Transmission of Immediate Mission

Status to Terminal Controller by Direct Air Support Center.

4008. Brief. The brief provides the aircrew with essential

information for execution of the mission. The terminal controller

may transmit the brief in one transmission or in bursts of several

lines, consistent with the communications security situation. The

brief follows a numbered format sequence; therefore, reference to

line numbers or elements is not required. The brief should be

passed to the aircrew as early as communications can be

established. As a last resort, the aircrew can receive the brief at the

contact pointlholding area. The terminal controller uses a CAS
briefing form. (See figure 4-5 on page 4-24.) Remarks may follow

the CAS briefing, as required. Information may be provided on the

threat, hazards, weather, ordnance delivery, attack heading,

airspace coordination, and so on.

Transmission:

Flight leader: "Tiger 14, this is Check 10-2, two F/A-18s inbound

Chevy 12 Rockeye' each, 0 + 30."

Terminal controller: "Roger, Check, proceed to Chevy, stand by for brief."

Flight leader: "Ready to copy."

Description of Transmission:

Identification Tiger 14, this is Check

Mission number 10-2

Number of aircraft and Two F/A-i 8s inbound Chevy 12 Rockeye each

type of ordnance

Time on station 0 + 30

Legend: 'The ordnance may be referred to by a preestablished code, for

example, D-22.

Figure 4-4. Example of Initial Contact Between

Aircraft and Terminal Controller.

Example

"Artillery firing in target area. . . remain above 1,000 feet inbound IP."

4-23
4-24

Transmission:

"Snake 045, left 12.3, 55, five armored vehicles moving north to south in

column, SS623 456, WP, south 1,000, egress south to ford.'

Description of Transmission:

IP or battle position Snake

Heading and offset 045, left

Distance 12.3

Target elevation 55

Target description Five armored vehicles moving north to

south in column

Target location SS623 456

Type of mark (if beacon or laser, WP

include appropriate code)'

Location of friendly forces1 South 1,000

Egress1 Egress south to ford

Legend: 'These elements may be omitted in a limited communications

environment.

Figure 4-5. Example of Close Air Support Briefing.

4009. Time. Immediately following the brief, the terminal

controller gives the aircrew the desired time for ordnance to impact

on the target. If both the terminal controller and aircrew are on a

synchronized clock, this time should be expressed as a TOT. Using

TOT eliminates the need for a hack and eases coordination of

target marking and SEAD. TOT and synchronized clock are

described in appendix D.
Example

Terminal controller: "Time on target 30."

Flight leader: "Roger, 30."

If a synchronized clock has not been established or is not

maintained by either the terminal controller or flight leader, TTT

may be used to coordinate the timing of the mission. TTT is the

number of minutes and seconds to elapse before the ordnance

impact on the target. The TTT is followed by the word "hack." The

ITT must allow sufficient time for the aircrew's response and

flight time. Generally, a TTT of six to eight minutes is used. The

aircrew must determine whether they can comply with the desired

TTT. The terminal controller passes the ITT to the aircraft as

shown in the following example.

Example

Terminal controller: "Six plus zero, zero. . . hack."

When the flight leader reads back the hack time, this indicates that

he has a good copy of the brief, that the hack was accomplished,

and that the hack allows sufficient time for the aircraft's response.

If the time is too short, he transmits "negative" and states a

required T1'T to allow aircraft positioning for ordnance delivery.

The countdown continues from the original hack.

Exam pie

"Negative, eight plus zero, zero."

4-25
4-26

The terminal controller then reexamines the situation and

determines whether the required TTT indicated by the pilot is

acceptable. If it is acceptable, the terminal controller restates the

TTT to the flight leader.

Example

"Eight plus zero, zero."

If the flight leader fails to copy all of the brief but can comply with

the hack, he notifies the terminal controller and indicates the

specific line(s) of the brief that he failed to copy. He also

acknowledges the hack. The countdown continues from the hack.

Example

Flight leader: "Tiger 14, Check 10-2, say again line two, roger, six plus zero,

zero."

Terminal controller: "045, left."

Ifthe flight leader missed parts of the brief and missed the hack,

then the transmissions are made as shown in the following

example.

Example

Flight leader "Tiger 14, Check 10-2, say again line two, negative hack."

Terminal controller: "045, left, six plus zero, zero. . . hack."

Flight leader: "Roger, six plus zero, zero."
At the end of the mission brief, the flight leader repeats the

TOT/TTT to notify the terminal controller that the flight leader

received and understood the entire mission brief.

4010. Mark, Adjustment, and Control of Initial Aircraft. A

laser, infrared, or munitions mark may be required to assist aircraft

in identifying the target. The preferred method of marking a target

is by laser if the aircraft has a laser seeker or airborne passive laser

spot tracker. A WP munitions mark, if required, will be timed to

impact 20 to 30 seconds before the established TOT or TTT; an

illumination mark (fuzed to bum on the ground) should impact 45

seconds before the TOT/TTT. If the attacking aircraft is in a

low-level approach, it will start to climb at a pullup point to gain

sufficient height from which to observe the mark and execute the

attack. The pilot will establish the pullup point somewhere

between the IP and the target. Positive clearance from the terminal

controller for the aircraft to drop/fire is normally required before

delivery of any ordnance. Before clearing the aircraft, the terminal

controller should have both the aircraft and target in sight and

ensure that the aircraft's wings are level and pointed in the correct

direction. (See paragraph 4013.)

a. Laser Mark. A laser mark is the most effective means of

improving accuracy of aircraft-delivered ordnance. The

combination of a laser mark and laser-guided weapons (LGWs)

provides the best results. If the aircraft is equipped with a laser spot

tracker, the pilot can also employ a laser mark to visually locate the

target and to conduct an accurate attack with unguided ordnance.

In a preplanned mission, the laser-on time may be specified in the

4-27
4-28

JTAR, in which case the terminal controller turns the laser on and

off as scheduled. The pilot will normally initiate laser on in

immediate and on-call missions. This is done by transmitting a "10

seconds" warning call that the aircraft will need laser on in 10

seconds, and then "laser on" when ready to acquire the laser. Pilots

may also use this technique to initiate laser on in preplanned

missions. Normal laser designation time is 20 seconds, although

pilots may request longer laser-on time by specifying a time after

transmitting "laser on," for example, "laser on, 30 seconds." If

communications are unreliable, the terminal controller should

begin designating 30 seconds before TOT or TTT. When the

terminal controller turns on the laser, he alerts the pilot and, if the

aircraft's wings are level and pointed in the right direction, clears

the pilot to attack by saying "cleared hot." The pilot confirms that

he sees the designated laser spot by transmitting "spot" and

acknowledges the clearance by repeating "cleared hot."

Minimizing laser-on time is important in a laser countermeasures

environment and when employing battery-operated laser

designators. The terminal controller will turn off the laser

designator when the pilot transmits "terminate," when the weapon

hits the targets, or after 20 seconds of laser designating (or longer

if specifically requested or if communications are unreliable).
Example

Flight leader: "10 seconds." (no response required)

Flight leader: "Laser on, 30 seconds." (Terminal controller may elect to turn

the laser on 10 seconds after the 10-second call without hearing the laser-on

call if communications problems are expected. Flight leader may request

longer laser-on time.)

Terminal controller: "Laser on, 10-2, (aircraft is wings level, on heading, and

pointed at the target), cleared hot."

Flight leader: "Spot, 10-2, roger, cleared hot."

Flight leader: "Terminate."

Offset designation procedures may also be used in a laser

countermeasures environment and, if required, will be indicated by

the terminal controller in the remarks section of the CAS briefing.

At the laser-on call, the terminal controller will designate an offset

position near the target to avoid alerting the target. The pilot will

then transmit "shift" to direct the terminal controller to shift laser

energy from the offset position onto the target itself. The "shift"

transmission, when used, can replace the "spot" transmission.

(Refer to chapter 9 and Joint Pub 3-09.1, Joint Laser Designation

Procedures, for more information on laser operations.)

b. Infrared Mark. Infrared pointers and other infrared devices that

can assist a terminal controller in marking a target at night are now

becoming available. Although these infrared devices can be very

effective in identifying targets to pilots who are wearing night

vision devices, they caimot be used to guide or improve the

accuracy of aircraft ordnance. These infrared devices should be

used only in situations where the enemy is unlikely to also have

night vision devices. Infrared marks should be initiated 20 to 30

4-29
4-30

seconds before the TOT/TTT or when requested by the pilot and

should continue until the pilot transmits "terminate" or the weapon

hits the target.

Exampie

Flight leader: "Sparkle on." (Terminal controller may elect to turn infrared

pointer on 30 seconds before the TOT/iTT without hearing the sparkle-on

call if communications problems are expected.)

Terminal controller: "Sparkle on, 10-2, (aircraft is wings level, on heading,

and pointed at the target), cleared hot."

Flight leader: "Spot, 10-2, roger, cleared hot."

Flight leader: "Terminate."

c. Munitions Marking. Marking with artillery, NGF, or mortar

fires is an effective means of assisting pilots in visually acquiring

the target, but, unlike laser marks, these means do not improve the

accuracy of aircraft ordnance. (See chapter 8 for artillery, NGF,

and mortar procedures to provide a mark for CAS aircrews).

Before choosing to mark by artillery, NGF, or mortars, observers

should consider the following:

• The ability of these munitions by themselves to achieve the

desired effects on the target

• The prudence of diverting these supporting arms from other

missions

• The danger of additional exposure of these supporting arms to

the enemy's indirect-fire acquisition devices
• The additional coordination between supporting arms required

for this mission.

If the decision is made to mark the target with another supporting

arm, WP marking rounds will be timed to impact 20 to 30 seconds

before the established TOT or TTT; illumination marks (fuzed to

bum on the ground) should impact 45 seconds before the

established TOT or TTT. When marking rounds appear, the

terminal controller transmits an adjustment and, if the aircraft's

wings are level and pointed in the right direction, clears the aircraft

to attack. An adjustment orients the pilot's eyes in the vicinity of

the target. Speed in adjustment is more important than accuracy

because this gives the pilot more time to identify the target. The

terminal controller makes the adjustment by using a cardinal

direction and distance (in meters) from the marking round to the

target. The terminal controller may need to specify the marking

round to help the pilot differentiate it from other munitions

exploding in the battlespace, for example, "from the mark WP,

west 200." If there is a prominent ground reference available, the

terminal controller can use it in the adjustment, for example, "from

the mark, west 200 in ravine." The pilot acknowledges the

adjustment by transmitting "tally mark" and the clearance by

transmitting "cleared hot." (See figure 4-6 on page 4-32.)

4-31
4-32

Figure 4-6. Adjustment From Marking Round.

exam pie

Terminal controller: "10-2, from the mark, west 200, (aircraft is wings level,

on heading, and pointed at the target), cleared hot."

Flight leader: "Tally mark, roger, (aircraft is wings level, on heading, and

pointed at the target), cleared hot."

The following applies should the pilot need help identifying the mark.

Terminal controller: "10-2, from the mark, illumination on deck, west 200,

(aircraft is wings level, on heading, and pointed at the target), cleared hot."

Flight leader: "Tally mark, roger, (aircraft is wings level, on heading, and

pointed at the target), cleared hot."

The following applies if a prominent ground reference is available.

Terminal controller: "10-2, from the mark, west 200 on north side of dirt road,

(aircraft is wings level, on heading, and pointed at the target), cleared hot."

Flight leader: "Tally mark, roger, (aircraft is wings level, on heading, and

pointed at the target), cleared hot."
d. Abort Procedures. If it is necessary to discontinue an aircraft's

run on a target, the terminal controller does so by transmitting

"abort, abort, abort."

4011. Adjustment and Control of Subsequent Aircraft. When

the flight consists of multiple aircraft, each aircraft may be

individually adjusted onto the target. Subsequent aircraft normally

trail preceding aircraft by approximately 30 seconds. This lapse

allows protection of aircraft from fragmentation. The adjustment

for subsequent aircraft is made from the preceding aircraft's hit or

from the impact of the marking round (whichever is closer to the

target) by using the same procedure (cardinal direction and

distance). (See figure 4-7 on page 4-34.) The terminal controller

provides clearance to attack in the same manner for subsequent

aircraft as for the lead aircraft.

Example

Terminal controller: "From lead's hit, east 200, cleared hot."

Wingman: "Roger, cleared hot."

The following example applies if the mark is closer than the lead's hit.

Terminal controller: "From the mark, west 200, cleared hot."

Wingman: "Tally mark, roger, cleared hot."

4012. Reattacks. As a general rule, a goal of CAS is to complete a

successful attack against all targets on the first pass. In a low or

medium threat, reattacks may 'be a viable option. The reattack

should ensure the desired effect on the target, allow visual

orientation by the pilot, and increase responsiveness to the ground

4-33
4-34

commander. If a reattack is conducted, the terminal controller will

give the pilot a pulloff direction and may assign different attack

headings. Additional marks or a narrative description of target

location in relation to the last mark, last hit, landmarks, terrain

features, or friendly positions may be given. The aircraft may also

be returned to the IP for reattack.

Nt

Figure 4-7. Adjustment for Dash 2.

4013. Reasonable Assurance. Aircrews must receive positive

clearance ("cleared hot") from the terminal controller before

releasing any ordnance. During peacetime training/exercises,

personnel involved in CAS missions must follow range training

regulations for release of ordnance. During combat operations,

battlespace conditions (communications jamming, low-altitude
flight, etc.) can prevent the terminal controller from being able to

positively clear aircraft to deliver ordnance. In such cases, aircrews

and supported units may have to rely on the concept of reasonable

assurance to complete the mission. Reasonable assurance allows

aircrews to deliver their ordnance without verbal clearance if they

are reasonably sure that they are attacking the proper target. The

MAGTF commander normally establishes the precise guidelines

and procedures for the use of reasonable assurance and

disseminates them throughout the MAGTF and supporting carrier

wings. Examples of reasonable assurance guidelines and

procedures include the following:

• The MAGTF commander declares that reasonable assurance is

acceptable for CAS missions under night or limited-visibility

conditions when the terminal controller's laser spot or

munitions mark can be positively identified by the pilot.

• The MAGTF commander declares that reasonable assurance is

acceptable for day visual attack when the pilot verbally

acknowledges the CAS brief.

4014. The Report. Following completion of the attack, a report

giving bomb damage assessment is provided by the terminal

controller. The report may be transmitted to the pilot, if still within

communications range, or to the DASC. (See figure 4-8 on page

4-36 for an example of a transmission of a report and a description

of the transmission.)

4-35
4-36

Transmission: —

"SS619 456, 0905, 0906, 75 over 80, four armored vehicles destroyed, one

turning east, 10 killed in action (KlAs), mission successful, T6G."

Description of Transmission:

Target coordinates (location of SS619 456

target when attacked)

Time on/off target (time of 0905, 0906

aircraft attack/time aircraft

completed mission and

departed)

Percent ordnance on 75 over 80

target/percent target destroyed

Results Four armored vehicles destroyed, one

turning east, 10 KIAs, mission successful

Unit supported by the mission T6G

Figure 4-8. Example of Report on Immediate Close Air

Support Mission.

4015. Air-Delivered Ordnance in Vicinity of Friendly Tiroops.

The accuracy of air-delivered ordnance is subject to many

variables. Therefore, unlike for indirect-fire weapons, a danger

close distance for the safe separation of air-delivered ordnance is

difficult to establish. When air-delivered ordnance is to be

delivered near friendly forces (danger close), a careful analysis

must be made. The air control agency must consider the situation

when selecting and assigning aircraft. Once assigned, the pilot

must incorporate this situation into the selection of his attack

tactics. Finally, the terminal controller must provide

data/instructions to assist the pilot in ensuring safe separation. As
with all CAS missions, the supported commander must approve its

delivery. Factors that may be considered when delivering

air-delivered ordnance in the vicinity of friendly troops include the

following.

a. Type and Size of Ordnance. The accuracy of air-delivered

ordnance varies with the type, size, and method of delivery of the

ordnance; the type of aircraft; and the pilot's proficiency.

b. Aircraft Type/Weapons System/Attack Tactics. The accuracy

of air-delivered ordnance varies with the type of aircraft and

weapons systems being employed. Sophisticated weapons enhance

delivery accuracy and reliability. Generally, high-angle delivery

enhances accuracy.

c. Attack Heading. The most common inaccuracies in delivering

ordnance occur in low dive angles, which result in errors in range

along the attack heading of the aircraft. Therefore, in proximity to

friendly forces, an attack heading that is parallel to friendly troops

enhances safety and is much preferred.

d. Weather in the Target Area. Low ceiling restricts aircraft

tactics and acquisition of the target.

e. Terrain in the Target Area. The position of the target on

terrain features (e.g., in a draw or on a hill) will influence the

aircraft's attack tactics and, therefore, accuracy.

f. Threat. The threat level and type of threat influence attack

tactics. In a high threat environment, low-level, high-speed tactics

4-37
4-38

may reduce accuracy. The characteristics of the threat weapons

(e.g., range, method of acquisition, etc.) will influence tactics as

well.

g. Availability and Visibility of Target/Marking. The

availability of a mark and its acquisition by the pilot enhance the

safe delivery of air-delivered ordnance.

h. Terminal Controller Proficiency. The availability of an

experienced FAC and his ability to control the airstrike will

enhance the safe delivery of ordnance. The ability to control

depends on the terminal controller's ability to see the target, the

mark, and the aircraft during its attack, as well as on

communications.

i. Type and Degree of Friendly Cover

4016. Emergency Procedures for Requesting Close Air

Support. In an emergency situation during combat, a need may

exist for an untrained Marine to request and adjust CAS. After the

requester identifies himself, he specifies where, when, and on what

he desires CAS and whether he can control the delivery. (See

figure 4-9 on page 4-39.)
Figure 4-9. Example of Emergency Transmission of a

Request for Close Air Support.

4-39

(reverse blank)

Transmission:

"I have five armored vehicles moving in column on road. Coordinates SS623

456, elevation 55. Need support ASAP. I cannot control."

Description of Transmission:

What (target description) I have five armored vehicles moving in

column on road.

Coordinates SS623 456, elevation 55.

Need support ASAP.

Where (target location)

When (time airstnke is

required: ASAP, NLT, at

specific time)

Whether (statement of whether

the requester can control,

observe, mark, correct)

I cannot control.

Chapter 5

Artillery and Mortar Special Situations

Section I. Artillery and Mortar High-Angle Fire

High-angle fire is "fire delivered at angles of elevation greater than

the elevation that corresponds to the maximum range of the gun

and ammunition concerned; fire, the range of which decreases as

the angle of elevation is increased." (Joint Pub 1-02) High-angle

fire is employed for artillery when the weapons fire out of defilade,

from within built-up areas, or over high terrain features near

friendly troops. It is also employed against targets in defilade when

the target is directly behind hill crests, in jungles, or in deep gullies

or ravines and cannot be reached by low-angle fire. All U.S.

artillery weapons are capable of high-angle fire. Mortars are used

to conduct only high-angle fire.

5101. Procedures. The FO procedures for the adjustment of

high-angle fire are the same as those for the adjustment of

low-angle fire. The FO must realize that small deviation

corrections during adjustment may be unnecessary and time

consuming because of the increased dispersion experienced during

high-angle fire. Because the TOF is long in both adjustment and

fire for effect, the FDC announces "shot" when the round is fired

and announces "splash" five seconds before the burst occurs. Fuze

time is not used in high-angle fire. If an air burst is desired, flize

VT provides excellent results.

5-1
5-2

Section II. Artillery and Mortar Precision Fire

The use of precision fire places a great deal of responsibility on the

observer. The FO must consider the time required, ammunition

expenditure, and signature of the firing unit in relation to the effect

to be gained from precision fire missions. There are two types of

precision missions: registration and destruction. When conducting

precision fire, an eight-digit grid should be used unless the P0 is

equipped with a laser rangefinder.

5201. Artillery Registration Missions. Registration is "the

adjustment of fire to determine firing data corrections." (Joint Pub

1-02) The FO is directed to conduct registrations when the firing

unit has no other means to determine firing data corrections to

improve its accuracy. The following types of registration will be

discussed: precision registration of artillery using fuze quick and

fuze time, second-lot registration, abbreviated registration, and

precision registration for mortars.

a. Precision Registration. A precision registration is conducted

with a single weapon. The FDO may instruct the FO to conduct a

registration on a designated point or may have the P0 select the

registration point. The registration point should be accurately

located, semipermanent, near the center of the zone, on fairly level

terrain if possible, and on common survey with the firing unit. The

registration may include an impact portion (adjustment of fuze

quick) or an impact and time portion (adjustment of fuze quick and

fuze time). The precision registration is initiated with an MTO.
Exam pie

FDC: "H18 this is H44, register on known point 2, quick and time, over."

FO: (Read back by observer.)

FO: "Direction 6400, over." (Transmission given when ready to observe.)

FDC: (Read back by FDC.)

FDC: "Shot, over."

FO: "Shot, out."

The FDC may provide a general vicinity for the observer to select a

registration point. In this case, the FO transmits the selected grid

(eight-place grid) with altitude and the direction.

Example

"Grid 6124 3843, altitude 210, direction 6310, over."

(1) Impact Portion (Adjustment of Fuze Quick). The objective

of the impact portion of a registration is to obtain spottings of two

overs and two shorts along the OTL from rounds fired with the

same data or from rounds fired with data 25 meters apart (50

meters when probable error in range is greater than or equal to 25

meters). These rounds are called usable rounds. This normally

requires spottings from four separate rounds. However, a "target hit" or a round that is spotted as "range correct" counts as a

spotting of both over and short. Therefore, the objective could be

achieved with two consecutive target hits or range correct

spottings. The following additional procedures apply.

(a) Deviation. The FO spots the rounds for deviation to the nearest

mil and brings rounds onto the OTL before splitting a 200-meter

5-3
5-4

bracket. Deviation corrections should not be made after a

200-meter bracket has been established. Once the FO brings the

rounds onto the OTL, he measures and records deviation spottings

but makes no correction. When a doubtful range spotting is

obtained, the FO corrects for deviation only. If a deviation

correction must be made after a 200-meter bracket has been,

established, the last round fired and all previous rounds cannot be

considered usable rounds for determining range and deviation

refinement data.

(b) Range. The FO spots the rounds for range (over, short, or

range correct) and makes range corrections by using successive

bracketing until a 50-meter range bracket is established (add or

drop 50). Once this round impacts, the FO makes his spotting,

makes a range correction to fire two rounds with data 25 meters in

the direction opposite that of the spotting, and sends "two rounds,

add or drop 25." If both rounds result in spottings of "short" (or

"over"), the FO changes the volume to one round and sends "add

25" (or "drop 25"). Firing is continued until two definite range

spottings have been obtained at the opposite end of the 25-meter

bracket.

(c) Refinement. When the requirement of two overs and two

shorts with the same data or data fired 25 meters apart has been

met, the impact portion of the registration ends with necessary

refinement data. Refinement data may include a deviation

correction, a range correction, or both to the nearest 10 meters.
When determining refinement data for range, the location of the

registration point is determined with respect to the two sets of

spottings and then refinement data is determined and announced. If

the registration point is nearer to the last round(s) fired, then no

range refinement is necessary to move the impact toward the

registration point. (See figure 5-1.)

Registration Point

**

Figure 5-1. No Range Refinement Necessary.

If the registration point is equidistant between the two sets of

rounds, then the observer determines the range refinement to be

"add 10" or "drop 10" from the last data fired. (See figure 5-2 on

page 5-6.)

5-5
5-6

Figure 5-2. Drop 10.

If the registration point is nearer to the pair of rounds at the

opposite end of the bracket, then the observer determines the range

refinement to be "add 20" or "drop 20" from the last data fired.

(See figure 5-3.)

Figure 5-3. Drop 20.

Registration Point **
The FO must keep track of the rounds and how they are spotted in

relation to the registration point. This is easily done by drawing a

registration diagram and numbering the rounds, as illustrated in

figure 5-4.

SECTION II REGiSTRATION

29. MESSAGE TO OBSERVER C OJ I(J 47t 29.01 DIRECTiON U(4 30. 01 FACTOR —

.100

CORRECTIONS SSPOTT1NOS fROUNDS g

31. INITIAL ROUND I .100 .u. ®

100 4t ®

.0 .

35.0 • . - 30. 0

•it 0

(.1040 ((C S (1I fl(Om

39. 40. 41. 42. 43

44

Figure 5-4. Example of Registration Diagram.

5-7

REVERSE oc GA FORI 54i9.R.JUNSS Legend

EOM = End of Mission REG = Register

KN PT • Known Point REG PT = Registration Point

REC = Record
5-8

Deviation refinement is determined by adding the deviation

spottings of the rounds establishing the two overs and two shorts.

This may include two, three, or four deviation spottings. This total

is then divided by the number of rounds to get an average

deviation, which is expressed to the nearest mu. The average

deviation multiplied by the OT factor equals the correction, which

is expressed to the nearest 10 meters. Figure 5-5 provides an

example of deviation corrections for impact registration.

The FO has determined four usable rounds with the following spottings:

Round Spotting

4 Over, 6 right

5 Short, 8 right

6 Short, 5 right

7 Over, 7 right

The FO determines the sum of the deviation spottings to be 26 right (6 right +

8 right + 5 right + 7 right).

The average deviation of 6 right (26 right divided by 4 rounds = 6.5 (6 right)) is

multiplied by the OT factor (3) to determine the deviation refinement of "left 20"

(6 right x 3 = 18 meters right ("left 20")).

If the spottings include right and left spottings, the observer must algebraically

compute the average deviation. For example, 7 right and 3 left equals 4 right.

If the calculated deviation refinement is less than 10 meters, it is omitted.

The registration point was equidistant between the two sets of rounds, as

illustrated in figure 5-2. The observer determines the range refinement to be

"drop 10."

The observer transmits the following correction: "Left 20, drop 10, record as

registration point, (end of mission or time, repeat)."

Figure 5-5. Example of Deviation Corrections for Impact

Registration.
If the MTO specified only an impact portion of the registration,

then the FO terminates the impact registration by transmitting his

refinement data followed by the announcement of "record as

registration point, end of mission."

Example

Left 20, drop 10, record as registration point, end of mission, over."

If the MTO specified an impact and time portion, then the FO

terminates the impact portion and initiates the time portion by

transmitting his refinement data followed by the announcement of

"record as registration point, time, repeat."

Example

Left 20, drop 10, record as registration point, time, repeat, over."

Note

Because the BCS/backup computer system (BUCS) uses only known points,

the FO may be required to transmit record as known point." In either case,

the FDC will send an MTO assigning a target number to the registration

point.

(2) Time Portion (Adjustment of Fuze Time). The objective of

the time portion of the precision registration is to correct the mean

HOB of four rounds fired with the same data to 20 meters above

the registration point.

5-9
5-10

(a) Adjustment If the first round is spotted as "graze," then a

correction of "up 40" is given. If the first air burst is extremely

high, the observer may send a "down" correction and repeat. Once

a measurable air burst has been obtained, the command is "three

rounds, repeat, over."

(b) Refinement. When four rounds have been fired with the same

data, the registration is ended with the appropriate correction to

achieve a 20-meter HOB. When four air bursts are spotted, the

HOB is corrected to 20 meters. The mean HOB is determined by

adding the four spottings (in mils), dividing by four, expressing the

sum to the nearest mu, and then multiplying by the OT factor,, This

is the same technique used in determining deviation corrections.

The sum is then expressed to the nearest five meters, and the

appropriate correction is determined to achieve the desired

20-meter HOB.

Example

"Up 10, record as time registration point, end of mission, over.

For mixed spottings, the following automatic corrections are used:

• Three air bursts and one graze—no correction required

• Two air bursts and two grazes—up 10

• One air burst and three grazes—up 20.
Check rounds may be fired to verify the validity of the time

registration; however, they are not necessary.

b. Second-Lot Registration. The FDC may direct the FO to

conduct a "two-lot" registration. Second-lot registrations are

conducted in a manner similar to that for first-lot (single)

registrations. After the first-lot impact registration has been

completed, a precision registration for fuze time is conducted, if

required. The FDC will announce to the FO "observe second-lot

registration" after the FO has recorded the registration of the first

lot. The FO must then establish the appropriate range bracket and

complete the second-lot registration. The time portion of the

registration is not fired with the second lot.

c. Abbreviated Registration. At times, the tactical situation or

ammunition constraints may prohibit conducting a full-scale

precision registration. Although not as accurate, an abbreviated

precision registration can compensate for the effects of

nonstandard conditions. (Abbreviated registrations are more

accurate and therefore more feasible if the FO is equipped with a

laser rangefinder). The FDO makes the decision to conduct an

abbreviated registration. For this type of registration, the FO

merely shortens the standard procedures of a precision registration.

(1) Impact Portion (Adjustment of Fuze Quick). Normal

adjust-fire procedures are followed until a 100-meter bracket is

split. The correction sent is "add (or drop) 50." The burst that is a

result of an "add (or drop) 50" is spotted. Minor corrections for

both deviation and range to the nearest 10 meters are sent to the

5-11
5-12

FDC, along with the announcement of "record as registration point,

(time repeat)," as shown in figure 5-6.

29. MESSAGE TO OBSERVER AS'S ccRiIa rn,a •ii 29.01 DIRECTION Otto 30. OT FACTOR —

01 .

I

I

.100

I

I 4

I 1

S

CORRECTIONS f SPOTI1NOS g

ROUNDS

31. INITIAL ROUND _•_®

®—

-we

4lCO

-e

-w

•2

.g

L.O,.4OUCAS

0

37. —- Uf40 Al 0

40q u ie, Cc AS 11 — 41.

43. 44

Figure 5-6. Example of Abbreviated Registration.

(2) Time Portion (Adjustment of Fuze Time). Normal adjust-fire

time-adjustment procedures are followed in the time portion. An

air burst is obtained and then corrected to a 20-meter HOB. Instead

of firing for effect, refinement is sent to the FDC, the time

registration point is recorded, and the mission is ended.

SECTION II REGOSTRA11ON

REVERSE OF DA FORM 5429.R. JUN OS
5202. Precision Registration for Mortars

a. Procedures. Precision registration for mortars is conducted for

impact fires only. The procedures are almost identical to the

precision registration of fuze quick (impact) procedures for

artillery. The exception are as follows:

• Only spottings of one round over and one round short are

required.

• Once a 100-meter range bracket has been split and the last fired

round is within 50 meters of the target, refinement corrections

are sent to the FDC and the mission is ended.

• Range refinements are made to the nearest 25 meters.

The transmissions to the FDC after the last two rounds are similar

to those used for artillery.

b. Sheaf Adjustment. The mortar sheaf must be adjusted to make

all of the mortars fire parallel. The sheaf may be adjusted at any

time during a fire mission but may be directed by the FDC after a

registration. The FDC will announce "prepare to adjust sheaf,

over." The mortars will be positioned and numbered in sequence

from right to left as seen from behind the tubes. For 81-mm

mortars, numbers may be one through eight when positioned as a

platoon and one through four for a two-section position.

5-13
5-14

I Note

In the 81-mm mortar platoon, the term "mortar section" refers to four tubes

(squads).

To adjust the sheaf, the observer requests "section right (or left),

repeat, over." Each squad will then fire, in order, from left to right

(or right to left) with 10-second intervals between rounds. The

mortar that was used to register will not fire.

Exampie

If the observer requests "section right, repeat, over" and number 2 conducted

the registration, then numbers 1, 3, and 4 would fire.

In adjusting the sheaf, all rounds must be adjusted on line at

approximately the same range (within 50 meters) and with 40

meters of lateral spread between rounds. Range corrections for

rounds impacting within 50 meters of the sheaf line are ignored.

The sheaf is adjusted perpendicular to the GTL. If angle T is

greater than 500 mils, then each piece is adjusted onto the

registration point and the FDC computes data for the sheaf. Lateral

refinement corrections are made to the nearest 10 meters, but

corrections of less than 50 meters are not fired. Once refinement

corrections for all mortars have been determined, the sheaf has

been adjusted. For example, the sheaf of an 81 -mm mortar platoon

is being adjusted where the platoon is employed in two 2-section

positions. Tube 2 conducted the registration. The observer has

requested "section right, repeat, over." (See figure 5-7 on page

5-15.)
Desired Burst Locations

34

100 Meters 0 50

Desired Burst Locations

•J E

Re9Isation

Pout

I I I 50 0 Meters 50 Figure 5-7. Example of the Adjustment of a Mortar Sheaf.

In this example, all rounds are within 50 meters of the conect

range. Only number 3 is more than 50 meters out on lateral

adjustment, so the adjustment for tube 3 is sent first. Then

refinement data for tubes 1 and 4 is sent as follows: "Number 3,

right 60, repeat; number 1, right 30, number 1 is adjusted; number

4, left 20, number 4 is adjusted, over."

Number 3 is now fired, and the round impacts 10 meters right of

the desired burst location. The observer transmits "number 3, left

5-15
5-16

10, number 3 is adjusted, sheaf is adjusted, end of mission, over."

Figure 5-8 shows the adjusted sheaf.

* * 'k*Point

I I I I

80 40 0 40 Meters Figure 5-8. Adjusted Mortar Sheaf.

5203. Destruction Missions. Destruction is "a type of adjustment

for destroying a given target." (Joint Pub 1-02) The destruction

mission is fired by using one weapon to destroy a point target. The

destruction mission is similar to a registration in that the FO

continues adjustments to establish a 25-meter bracket by adding or

dropping 10 meters. He then continues to fire additional rounds,

making corrections to the nearest 10 meters after every third round

until the target is destroyed or the mission is ended. After every

third round, an additional refinement is made, and firing is

continued until the target is destroyed or the mission is ended.

Corrections may be made after every round if desired. Because of

the amount of time and ammunition required, destruction missions

should be used only when required by the tactical situation. Only a

target that is critical to. an operation should be engaged in this

manner, and only if no other means exists to destroy the target, for

example, Copperheads. An example of a destruction mission is

shown in figure 5-9 on page 5-17.
Round Spotting Correction

.30 left Right 60, add 800

2 +15 right Left 30, drop 400

3 -5 right Add 200

4 +4 right Drop 100

5 -4nght Add5O

6 +5nght Drop 25

7 -4nght Add 10'

8 +5 right Repeat

9 -4 light Repeat 10 Rangecorrect LeftlO2

1 Target Repeat

End of mission

bunker destroyed

Figure 5-9. Example of Destruction Mission.

5-17

FO Transmission:

FOC Transmission:

FO Transmission:

FDC Transmission:

FO Transmission:

FDC Transmission:

1144 this is 1118, adjust fire, over."

(FDC reads back.)

"Gnd 4324 9684, altitude 100. over."

(FOC reads back.)

"Enemy machine gun bunker, destn.jction, over."

(FDC reads back.)

'Target was midway between the (our spotting rounds.

2Preponderance was: 4 right+5flghl *4nghl l3right5 3 4.3 nght

4 light a 2(01 factor) = 8 light 10 light. Correction is left 10. 3Mlaaion ended because target was destroyed.
5-18

Section III. Artillery High-Burst or Mean Point of Impact

Registrations

The opportunities for a precision registration are limited because it

requires visual observation on a clearly defmed, accurately located

registration point in the target area. At night, visual adjustment of

fire on a registration point is impossible without some lype of

illumination or night observation device. In desert, jungle, or arctic

operations, clearly defined registration points in the target area are

not usually available. Special procedures, including observation

techniques, have been developed to provide for registration under

these conditions. Two such procedures are the high-burst (HB) and

MPI registrations.

5301. General. An HB and an MPI registration are identical,

except that the rounds for an HB registration are air bursts and the

rounds for the MPI registration are impact rounds. Two FOs

(referred to as 01 and 02) are required to conduct these

registrations. Each FO must occupy a surveyed OP and have a

means to accurately conduct angular measurement, such as a BC

scope, aiming circle, or MULE. Directional control, or a line of

known direction, must be established on the ground so that the FO

can orient his instrument for direction. For night observation, this

may require the orientation of instruments during daylight. The

exact location of the instrument and the line of known direction

should be marked so that they can be identified during darkness.

Additionally, for HB registration, one P0 must be prepared to

measure vertical angles.
5302. Procedures for High-Burst Registration

a. Initial Orientation of the Observing Instruments. To prepare

the instruments for orientation, the exact location of the instrument

and lines of known direction must be known. The instrument (BC

scope or aiming circle) is then placed over the position marker and

leveled. To orient the instrument, an azimuth of known direction is

placed on the azimuth scales using the upper recording motion.

Then, using the lower nonrecording motion, the vertical cross line

in the reticle is aligned on the marker or point that identifies the

known direction. The instrument is then considered to be properly

oriented for direction. If more than one known direction is

available, this can be used to check the orientation of the

instrument by using the upper motion. Once the instrument is

oriented, the lower motion should not be touched. All angular

measurements are taken byusing the upper motion.

b. Observing the High-Burst/Mean Point of Impact

Registration. For the I-LB registration, the two FOs simultaneously

observe time fire aimed at a point in the air above the target area.

The FDC selects the point at which the fire is to be aimed by

selecting a point on the ground in the area in which the registration

is desired and projecting this point into the air with a prescribed

HOB. This is the orienting point. The FDC controls the firing of

the FIB registration. One weapon is used to fire the registration. All

rounds are fired with the same data. Each FO reports the direction

from his position to the bursts. One of the FOs will be directed to

report the vertical angle after each round. For the MPI, the

5-19
5-20

registration is the same, except the rounds are fired with fuze

quick.

c. Orientation of the Observing Instruments on the Orienting

Point. The FDC orients the FOs by sending an MTO that tells each

FO the direction and vertical angle from his position to the selected

orienting point.

Example

"Message to observer, observe HB registration, 01 direction 1164, vertical

angle plus 12. Measure the vertical angIe, 02 direction 0718, vertical angle

minus 3. Report when ready to observe."

Each FO sets the direction given to him on the azimuth scales of

his instrument, using the upper motion. In the case of a MULE, the

designator is rotated to the correct direction. The horizontal line of

sight of the instrument now coincides with the horizontal line of

sight from the FO's position to the orienting point. Each FO sets

the vertical angle given to him on the elevation scales to orient the

instrument for HOB. The manner in which the FO sets the vertical

angle on the scales depends on the type of observing instrument

being used.

(1) Aiming Circle. The elevation scales on the M2 aiming circle

are ideally graduated so that a zero reading on the scales

corresponds to a vertical angle of zero. However, a correction

factor using the tubular leveling vial must be determined and

applied. Refer to MCWP 3-16.3/FM 6-50. The scales are graduated

and numbered in each direction from zero. In one direction, the
graduations are printed in black; those in the opposite direction are

red. Positive (plus) vertical angles are indicated by the black

numbers, and negative (minus) vertical angles are indicated by the

red numbers. The elevation scales on the aiming circle are operated

with the elevation micrometer knob. The elevation micrometer

knob is used to level the tubular leveling vial. The corresponding

elevation is the correction factor and is applied to all readings.

Example

Orient to vertical angle ÷12 with a correction factor of -3; set off vertical angle

+15 (12- (-3)).

Orient to vertical angle +12 with a correction factor of ÷3; set off vertical

angle +9 (12 - (+3)).

Ifthe vertical angle given to the FO is a positive angle, the FO sets

its value on the elevation scales in the direction represented by the

black numbers. If the vertical angle is a negative value, he uses the

red numbers. This action places the center of the cross lines in the

reticle of the instrument in line with the point in the air selected as

the orienting point.

(2) Battery Commander Scope. If the FO is using a BC scope, he

orients the instrument for HOB by applying the vertical angle to

the angle-of-site scales. These scales are graduated so that a

vertical angle of zero corresponds to a reading of 300 on the

angle-of-site scales. If the vertical angle is positive, its value is

added to 300 and the resulting number is set on the angle-of-site

scales. If the vertical angle is negative, its value is subtracted from

300 and the remainder is placed on the angle-of-site scales.

5-21
5-22

Example

The vertical angle is +12; the reading set on the angle-of-site scales is 312

(300 + 12).

The vertical angle is - 3; the reading set on the angle-of-site scales is 297

(300-3).

After setting the reading on the angle-of-site scales, the FO levels

the angle-of-site mechanism by using the elevation knob to center

the bubble in the level vial. This action places the center of the

cross lines in the reticle of the instrument in line with the point in

the air at which the rounds will be fired.

d. Measuring and Reporting the First Round. When the FOs

report "ready to observe," the FDC directs the firing of the rounds

One at a time. The FDC reports "shot" and "splash" for each round.

When the burst of the first round appears, each FO determines the

direction to the round by spotting the horizontal deviation from the

vertical cross line and then combines this value with the reading on

the azimuth scales. If the deviation is to the right of the vertical

cross line, he adds the value to the reading on the azimuth scales. If

the deviation is to the left of the vertical cross line, the FO

subtracts the value from the reading on the instrument (RALS).

The FOs report their observations in turn.

"01 direction

"0

Example —, vertical an

2 direction , gle —, over."over."
e. Determining the Vertical Angle. The vertical angle to the burst

is determined in one of two ways.

(1) Aiming Circle. If using an aiming circle, the FO spots the

number of mils that the burst appears above or below the

horizontal cross line in the reticle of the instrument and combines

this reading with the reading on the elevation scales.

Example

The burst appears 10 mils above the horizontal cross line, and the reading

on the elevation scales is +20. The vertical angle to the burst is +30 (20 +

10). With a correction factor of +3, the vertical angle is +27 (30 - (+3)).

The burst appears 10 mils below the horizontal cross line in the reticle of the

instrument, and the reading on the elevation scales is +6. The vertical angle

to the burst is -4 (6 + (-10)). With a correction factor of -3, the vertical angle

is-I (-4-(-3)).

(2) Battery Commander Scope. If using a BC scope, the FO reads

the number of mils that the burst appears above or below the

horizontal cross line in the reticle of the instrument and combines

this reading with the reading on the angle-of-site scales. The value

of the vertical angle is the difference between this combined

reading and 300. If the combined reading is greater than 300, the

value of the vertical angle is positive. If the combined reading is

less than 300, the value of the vertical angle is negative.

5-23
5-24

Example

The burst appears 20 mils above the horizontal cross line, and the reading

on the angle-of-site scales is 305. The vertical angle is +25 (305 + 20 = 325;

325 - 300 = +25).

f. Unobserved Spottings. If the FO does not observe the initial

round within the field of view of his instrument, he should report

this and the location of the burst to the FDC.

Example

"02 round unobserved, too far left, over."

g. Reorienting on the First Round. Once the FO has reoriented

his instrument on the direction and vertical angle where the initial

round burst, he will report the direction (and vertical angle if

applicable) of the first round to the FDC. (See figure 5-10 on page

5-25.) This will allow for smaller deviation measurements for

subsequent rounds.

h. Measuring and Reporting Subsequent Rounds. The

procedures for measuring and reporting direction and vertical angle

for subsequent rounds are the same as those for the first round.

However, the FO typically does not reorient his instrument after

subsequent rounds. Depending on the proficiency of the observer,

he may reorient on each subsequent round. This is most beneficial

when the registration point is not affected by strong winds and the

observer is equipped with an aiming circle. When the Ft)C has
obtained enough readings to compute the registration data, it

terminates the registration by sending "end of mission" to 01.

Figure 5-10. Reorientation After the First Round.

5303. Procedures for Mean Point of Impact Registration. In an

MPI registration, the FDC selects a ground location as the

5-25

I -

The initial orientation for the FO was Oirection 0430, vertical angle

+15" After the burst of 40 mils left of the vertical cross line, the FO

determines a direction of 0390. The burst appeared five mils below

the horizontal cross line, with a setting on the elevation scales of +15;

therefore, the FO obtains a vertical angle of +10. After reporting the

instrument readings for the first round, the FO reonents his instrument

on a direction of 0390 and a vertical angle of +10.
5-26

orienting point and uses impact fuzes in the registration. The

establishment of the OPs and the procedures followed by the FOs

are the same as those in an HB registration.

Section IV. Artillery Improved Conventional Munitions

ICMs are HE base-ejection projectiles with a mechanical time fuze

and a body assembly containing a number of submunitions. The

submunitions (grenades) are ejected through the base of the

projectile and scattered in the target area. There are two types of

1CM rounds: the antipersonnel round and the dual-purpose round.

Table 5-1 shows the number of grenades in each 1CM round.

Table 5-1. Number of Grenades in Each Improvedi Conventional Munitions Round.

1CM Weapon Projectile Number of Grenades

Antipersonnel 105 mm M444 18

155 mm M449 family 60

105 mm M915/6 42

Dual purpose 155 mm M483A1 88

155 mm M864 72

226-mm Multiple

Launch Rocket

System (MLRS)

M79 644

5401. Antipersonnel Round. The antipersonnel round is most

effective against exposed personnel. When the fuze functions, an

expelling charge forces the grenades out through the base of the
projectile. Small vanes on each grenade flip forward, arming the

grenade and stabilizing it in flight. (See figure 5-11.) When the

striker plate (on the base of the grenade) makes contact with the

ground, the grenade is hurled upward four to six feet in the air and

detonates. Antipersonnel 1CM (APICM) is no longer manufactured

but is still held in war reserve.

Figure 5-11. Improved Conventional Munitions Grenades.

5402. Dual-Purpose Round. The dual-purpose round is effective

against lightly armored or thin-skinned vehicles. However, it is

also very effective against personnel. After the grenade is ejected, a

ribbon streamer arms and stabilizes it during its descent. (See

figure 5-1 1.) On impact, a shaped charge that can pierce 2.75

5-27

1 O5.mmil 55-mm1203-mm

APICM Grenade

I55-mm/203-rnmJMLRS

DPICM Grenade
5-28

inches of rolled steel armor is detonated. The surrounding steel

case fragments are very effective against personnel.

5403. Dispersion. All 1CM projectiles are base ejecting. The fuze

functions at varying HOBs, and an expelling charge is detonated

that ejects the entire payload of submunitions out the rear of the

projectile. Centrifugal force disperses the grenades radially from

the projectile line of flight. The size and shape of bomblet

dispersion patterns are not constant and change over range. Also,

the concentration of bomblets is not uniform over the entire surface

area. There is a noticeable decrease of submunitions in the center

of the dispersion pattern; this is sometimes referred to as the

doughnut effect.

a. Antipersonnel Improved Conventional Munitions. M449

APICM dispersion is generally elliptical in shape. It disperses its

submunitions approximately 100 meters by 60 meters. Depending

on the observer's orientation to the GTL, he could see a varying

distribution of submunitions.

b. Dual-Purpose Improved Conventional Munitions. M483A1

DPICM dispersion generally changes shape from elliptical at

minimum ranges and lower charges to almost circular at maximum

ranges. This variation is due primarily to angle of fall and HOB. At

minimum ranges, the dimensions are approximately 50 meters by

100 meters. At maximum ranges, they are approximately 100

meters by 120 meters. Unless the observer is close to the GTL at

minimum ranges, he should see bomblet dispersion of

approximately 100 meters per projectile.
c. Base Burn Dual-Purpose Improved Conventional Munitions.

M864 base burn DPICM (BBDPICM) is currently held in war

reserves. Despite having fewer grenades, its dispersion pattern is

larger than that of DPICM. However, because it is designed for

employment at higher ranges, which produce a steep angle of fall,

the dispersion pattern is typically circular. At its designed ranges,

the dimensions are approximately 150 meters by 150 meters.

d. Battery Computer System Special Circular Sheaf. Based on

the dimensions of a single projectile's dispersion, the dimensions

of the typical sheaf can be predicted. The default BCS special

circular sheaf is a 100-meter radius with aim points equally

distributed on a concentric circle at half the target radius (50

meters). Depending on the range, the DPICM sheaf is typically 200

meters by 200 meters. Figure 5-12 on page 5-30 shows four guns

firing DPICM at maximum range and at shorter ranges. Angle T

can affect what the observer sees regarding the sheaf. The

BBDPICM sheaf is consistently 250 meters by 250 meters. Figure

5-13 on page 5-30 shows four guns firing BBDPICM. Note that

errors as a result of the dispersion of the projectiles can cause a

random gap or overlap within the sheaf.

5404. Improved Conventional Munitions Call for Fire and

Adjustment. The 1CM call for fire is the same as any call for fire.

(See figure 5-14 on page 5-3 1.) The FO identifies the type of 1CM

that he wants to be fired in effect by referring to APICM as

APICM and DPICM as 1CM. BBDPICM is only employed at

ranges beyond DPICM, as determined by the FDC. (See appendix

F.) Normal corrections for HE in adjustment apply; however, the

5-29
5-30

fire-for-effect phase is entered once a 200-meter bracket is

established. Procedures for the adjustment of the 1CM follow.

Figure 5-12. M483A1 Dispersion Pattern at Maximum arid

Minimum Ranges.

Figure 5-13. M864 Base Burn Dispersion Pattern.

M864 - Base Burn

of Fir.
HE Adjustment—DPICM in Effect

"P51 this is P87, adjust fire, over."

"Grid 933 876, over."

"Infantry company halted, APICM in effect, over."

Fire for Effect With DPICM

"P51 this is P87, fire for effect, over."

"Grid 372 461, over."

"Platoon assembly area, 1CM, over."

Figure 5-14. Example of Improved Conventional Munitions

Missions.

a. Range and Deviation. Because of the size of the effects pattern,

deviation shifts of less than 50 meters and range corrections of less

than 100 meters should not be made. Normal range and deviation

corrections are used when adjusting DPICM in the self-registering

mode.

b. Height of Burst. Because of the reliability of the round, no

adjustment for HOB is required before firing for effect. However,

errors in either target location or firing solution can produce effects

other than the designed HOB. The result is bomblet dispersion that

is either too large to be effective or too small to adequately cover

the target area. If a repeat of fire for effect is required, HOB may

then be adjusted. The observer corrects the HOB up to increase

dispersion and corrects it down to decrease dispersion. Corrections

are made in 50-meter increments.

c. Danger Close. When adjusting close-in fires with 1CM, the

observer must start the adjustment at least 600 meters from

5-31
5-32

friendly troops, depending on the relative locations of weapons, the

target, and friendly troops. Special consideration must be given to

the direction and speed of the wind in the target area. The

adjustment should be made with the entire battery. Corrections

should be made from the near edge of the effects pattern. Use of a

converged sheaf should be considered to decrease the size of the

sheaf.

5405. Employment Considerations. 1CM should not be fired into

wooded areas. The grenades become suspended in tree branches

and later pose a threat to friendly forces. Discretion should be

exercised when using 1CM in an area that friendly forces must

cross because the unexploded submunition rate is approximately

1.5 percent. Precautions should be taken when firing 1CM rounds

in snow, marshy areas, and loose sand. These types of terrain

conditions do not increase the dud rate but do pose more of a threat

to friendly forces by concealing duds. Slopes of more than 60

degrees reduce the effectiveness of 1CM. Because of the large area

covered, limited use is recommended close to unprotected friendly

troops.

Section V. Artillery Family of Scatterable Mines

FASCAM are time-sensitive, seif-destructing mines that are

emplaced by different assets, including aviation. Artillery

FASCAM consists of antiarmor and antipersonnel mines in a

base-ejecting projectile. These FASCAM projectiles consist of the
remote antiarmor mine system (RAAMS) and area denial artillery

munitions (ADAM).

5501. Remote Antiarmor Mine System Projectiles. RAAMS

minefields are used against enemy armored vehicles. The RAAMS

projectile is fired by a 1 55-mm howitzer, and nine antiarmor mines

are base ejected over the target area. After a short delay to allow

for mine freefall, impact, and roll, the magnetically fuzed mines

arm themselves. Some of the mines have an antidisturbance feature

that causes the mines to detonate if they are moved or picked up. If

the RAAMS mines are not detonated, they will begin to

self-destruct after 80 percent of the factory-set self-destruct time

elapses.

a. M718 Projectile. The M718 projectile has a long-duration

factory-set self-destruct time (48 hours).

b. M741 Projectile. The M741 projectile has a short-duration

factory-set self-destruct time (four hours).

5502. Area Denial Artillery Munitions Projectiles. ADAM

mines are used against personnel. They can be used against

dismounted personnel in an armored attack or on existing antitank

obstacles to hinder dismounted breaching. When employed against

an enemy that has a dismounted breaching capability, ADAM

mines are delivered directly on top of a RAAMS minefield.

ADAM rounds are always the last rounds fired when used in

conjunction with RAAMS or other munitions. This prevents the

5-33
5-34

activation or destruction of the ADAM munitions by the other

means.

The ADAM projectile is fired by a 155-mm howitzer, and 36

antipersonnel mines are base ejected over the target area. When an

ADAM mine comes to rest on the ground, several tripwire sensors

are deployed out to a maximum distance of 20 feet. When a sensor

is disturbed or tripped, a small ball-like munition is propelled two

to eight feet upward. The munition detonates and scatters

approximately 600 1.5-grain steel fragments in all directions. If the

mine tripwire sensors are not disturbed, the mine will self-destruct

after the factory-set time has elapsed.

a. M692 Projectiles. The M692 projectile has a long-duration

factory-set self-destruct time (48 hours).

b. M731 Projectiles. The M731 projectile has a short-duration

factory-set self-destruct time (four hours).

5503. Types of Minefields. Three types of RAAMS/A]DAM

minefields may be used, depending on the amount of planning and

coordination time available and the density of the mines. The three

types are planned minefields, target-of-opportunity minefields, and

minefields used with other munitions.

a. Planned Minefields. These minefields are normally initiated

and coordinated at the higher level. They are scheduled or on-call

targets to support barrier/obstacle plans. They consist of long or

short self-destruct mines. Safety zones are computed before firing.
b. Target-of-Opportunity Minefields. These minefields are

initiated through the call for fire and support the maneuver

commander with an immediate minefield. They consist of only

short self-destruct mines. The standard minefield module is 400

meters by 400 meters. Target-of-opportunity minefields are

normally low density with a combination of RAAMS and ADAM

projectiles. The number of projectiles varies depending on the

range, angle of fire, and minefield attitude. The safety zone is

based on aim points and is computed immediately after firing. The

safety zone contains 99 percent of the deployed mines and

represents the effective friendly obstacle for maneuver elements.

c. Minefields Used With Other Munitions. Minefields

established in conjunction with an attack using other munitions are

initiated through the target list or the call for fire. They support

operations by harassing enemy targets within constraints set by the

supported commander. These minefields are sized on the basis of

the method of attack and use of RAAMS, ADAM, or a

combination in the last volley. They consist of only short-duration

mines. The safety zone is computed immediately after firing.

5504. Target Location

a. Moving Targets. The aim point for a moving target is placed

directly in front of the enemy axis of advance. An aim point is

placed 1,000 meters in front of the enemy target for every 10

kilometers per hour of speed, as shown in figure 5-15 on page

5-36. This allows enough time for mine delivery and arming before

an enemy encounter.

5-35
5-36

+ Aim Point

I

I

I

I

I

I

Il,000m x kt =x'

Figure 5-15. Aim Point Location for a Moving Target.

b. Stationary Targets. The aim point for a stationary target is

placed directly over the target center. Aim points are located to an

accuracy of 100 meters for adjust fire and 10 meters for fire for

effect. If adjustment is necessary, it will be conducted with shell

M483A1 in the self-registering mode.

5505. Family of Scatterable Mines Call for Fire and

Adjustment. The FASCAM call for fire is usually transmitted and

processed in the same manner as other requests for

target-of-opportunity fire missions. The adjusting shell is DPICM

in self-registration mode and shell ADAM, which is always fired

last. Targets of opportunity are either fire-for-effect or adjust-fire

missions. Missions within 1,000 meters of friendly forces should
be referred to the firing-unit FDC for computation of the buffer

zone before firing. Adjustment procedures for FASCAM are

identical to those described for 1CM. Figure 5-16 shows two

different examples of a FASCAM call for fire.

Fire-for-Effect Mission

FO: "Z57 thisis Z42, fire for effect, over."

FDC: (FDC reads back.)

FO: "Grid 1804 5132, over."

FDC: (FDC reads back.)

FO: "Platoon in the open, ADAM, over."

FDC: (FDC reads back.)

Adjust-Fire Mission

FO: 257 this is Z42, adjust fire, over."

FDC: (FOG reads back.)

FO: "Grid 180 513, over."

FOC: (FOC reads back.)

FO: "Five 1-72 tanks attacking, RAAMS in effect, over."

FDC: (FOG reads back.)

Figure 5-16. Example of Family of Scatterable Mines Call for

Fire.

5506. Employment Considerations. Authorization for FASCAM

employment is established in the OPORD and is usually held at the

regimental level. Caution should be exercised when employing

these mines in areas where friendly troops are likely to move.

Although the mines have a self-destruct mechanism, the dud rate is

comparable to that of DPICM.

5-37
5-38

Section VI. Artillery and Mortar Illumination

Battlespace illumination gives friendly forces enough light to aid

them in ground operations at night. Illumination also facilitates

operations for both the FO and the maneuver unit. Characteristics

of artillery illumination are contained in appendix A. See chapter 6

for NGF adjustment procedures for illumination.

5601. Employment of Illumination. Illumination should be used

with caution to avoid the accidental compromise of or interference

with a friendly unit by premature or inappropriate fires. These fires

must be coordinated before delivery if it is suspected that the

effects of these fires will cross the boundary of an adjacent unit.

a. Volume. The amount of illumination that is required for a

particular mission depends on the OT distance; the conditions of

visibility; and the size, width, and depth of the area to be

illuminated. By selecting the proper illuminating pattern and

controlling the rate of fire, the FO can illuminate an area

effectively with a minimal expenditure of ammunition. See table

5-2 on page 5-39 for the rates of fire for continuous illumination

and other information on the employment of illuminating shells.

b. Uses. Illumination shells are used for the following:

• Illuminating areas of suspected enemy activity

• Providing illumination for night fires
Table 5-2. Employment Factors for Illuminating Shells.

Howitzer!

Mortar Projectile

Initial

HOB

(m)

Distance

Between

Bursts

(Spread)

(m)

Burning Time

(sec)

Rate of

Continuous

Illumination

(rounds/mm)

Rate of

Descent

(m!sec)

155 mm M-485A2 600 1000 120 1/2 5

81 mm M-301A1 400 500 60 1 6

81 mm M-301A2 400 500 60 1 6

81 mm M-301A3 600 500 60 1 6

• Harassing enemy positions

• Furnishing directions to friendly troops for attacks or patrol

activities

• Marking targets for attack by CAS

• "Washing out" enemy passive night-sight systems.

5602. Illumination Patterns

a. One-Gun Illumination Pattern. The one-gun illumination

pattern is used when effective illumination can be obtained by

firing one round at a time. To get this pattern, the FO calls for

illumination as the type of adjustment and type of projectile.

b. Two-Gun Illumination Pattern. The two-gun illumination

pattern is used when an area requires more illumination than can be

5-39
5-40

furnished by one-gun illumination. In two-gun illumination, two

rounds are caused to burst simultaneously in the same place. To get

this pattern, the FO requests "illumination two guns." This pattern

is not necessary with the M485A2 155-mm projectile.

c. Two-Gun Illumination Range Spread Pattern. The two-gun

illumination range spread pattern is used when the area to be

illuminated has greater depth than width as seen along the OTL

(GTL for mortars). (See figure 5-17.) Spread illumination causes

less shadow than illumination that is concentrated in one place. To

get this pattern, the FO calls for "illumination range spread." The

FDC centers the spread over the point indicated by the FO and

orients the spread along the OTL for artillery (unless GTL is

requested) and along the GTL for mortars. (See table 5-2 on page

5-39 for distance between bursts.)

Figure 5-17. Illumination Range Spread.

)J(Target

'Is
d. Two-Gun Illumination Lateral Spread. The two-gun

illumination lateral spread pattern is used when the area to be

illuminated has greater width than depth. (See figure 5-18.) To get

this pattern, the FO calls for "illumination lateral spread." The

FDC centers the spread over the point indicated by the FO and

orients the spread perpendicular to the OTL for artillery and to the

GTL for mortars. Distances between bursts are the same as those

for a range spread.

e. Four-Gun Illumination Range and Lateral Spread. The

four-gun illumination pattern is used to illuminate a large area.

(See figure 5-19 on page 5-42.) Four rounds are caused to burst

simultaneously parallel and perpendicular to the OTL for artillery

(GTL for mortars). This pattern illuminates an area with practically

5-41

>(Target

Figure 5-18. Illumination Lateral Spread.
5-42

no shadows or dark spots. To get this pattern, the FO calls for

"illumination range and lateral spread." The pattern of bursts is the

combination of range and lateral spreads.

Figure 5-19. Illumination Range and Lateral Spread.

5603. Illumination Call for Fire and Adjustment

a. Call for Fire. In the illumination call for fire, "illumination" is

given as the type of projectile, and, if desired, the appropriate range

or lateral spread is given as the distribution. (See figure 5-20 on

page 5-43 for an example of an illumination mission.)

S.

'I' S.. .5

)L(rarget

'I.
"P53 this is P67, adjust fire, over." "Grid 616 376, over." "Vehicle noises,

suspected tanks, illumination, over."

This fires illuminating round bursts about 100 mils left of the suspected area

and burns out 40 mils too high (measured with binoculars). Using an OT

factor of 2, the observer transmits:

"Direction 5800, right 200, down 100, over."

Deviation (100 mils x 2 = 200 meters).

HOB (40 mils x 2 = 80 meters 100 meters).

The second round bursts short near the OTL but is too low. The round burns

for six seconds on the ground. The observer requests:

"Add 400, up 50, over."

(6 x 5 = 30 meters>> 50 meters).

The third round bursts at the appropriate height over the suspected area, but

haze and the distance between the suspected area and the observer cause

poor visibility when only one illuminating round is used. The observer believes

that two rounds will be adequate to extend the visible area and reduce

shadows. He requests:

"Lateral spread, over."

Two rounds burst in a lateral spread over the suspected area. The observer

notices two tanks and a number of infantrymen moving to the right of the

extreme edge of the illuminated area. He then prepares and transmits a

second call for fire, moves his illumination over to the adjusting point, and

transmits 'illumination mark" when maximum illumination of the target has

been obtained:

"Right 400, coordinated illumination, over." 'Adjust fire, over." "Grid 611 382,

over." 'Two tanks and platoon of infantry. 1CM in effect, over."

The observer may also have sent his target location by polar plot ("Adjust fire,

polar, Over.") or by shifting from the center of the illumination ("Adjust fire,

shift, illumination, over.").

The observer transmits "illumination mark" when maximum illumination of the

target has been obtained. He then adjusts the HE and fires for effect.

Figure 5-20. Example of Illumination Mission.

b. Adjustment. Procedures for adjusting illumination are

discussed below.

5-43
5-44

(1) Range and deviation corrections are made in 100-meter

increments. The adjustment of illumination to within 200 meters of

the adjusting point is considered to be adequate because of the size

of the area illuminated by the flare. Range and deviation

corrections of less than 200 meters should not be made.

(2) The correct position of the flare in relation to the area to be

illuminated depends on the terrain and wind. Generally, the flare

should be to one flank of the area and at about the same range. In a

strong wind, the point of burst must be upwind from the area to be

illuminated because the flare will drift. If the area is on a forward

slope, the flare should be on the flank and at a slightly shorter

range. For illuminating a very prominent object, visibility is better

if the flare is placed beyond the object so that the object is

silhouetted.

(3) The proper HOB is obtained when the flare bums out just as it

strikes the ground. HOB corrections are made in multiples of 50

meters. Variations in time of burning between individual flares

make any finer adjustment of the HOB impractical. When burnout

occurs during descent, the HOB correction is made by estimating

the height of the flare when it burned out. When visibility permits,

the spotting (height of the burnout above the ground) may be

measured with binoculars. The HOB spotting (in mils) is

multiplied by the OT factor to determine the height of burnout (in

meters). The height is expressed to the nearest 50 meters and is

sent as a down correction.
Example

The flare burns out 20 mils above the ground. The OT factor is 3. The

correction is "down 50" (20 mils x 3 = 60 (50 meters)).

When the flare continues to burn after it strikes the ground, a

correction is required to raise the HOB. The length of time in

seconds that the flare bums on the ground is counted and

multiplied by the rate of descent. (See table 5-2 on page 5-39.) The

product is expressed to the nearest 50 meters and sent as an up

correction.

Note

When using a night observation device, the FO should ensure that the flare

bums out appreciably (100 - 200 meters) above the adjusting point to keep

the device from washing out.

5604. Coordinated Illumination. When the FO has Located a

target suitable for HE or other fire, he initiates a call for fire by

announcing "coordinated illumination" and then the mission data.

(See figure 5-20 on page 5-43.) If no better means of designating

the location of the target is possible, the burst center of the

illumination can be used as a reference point.

Example

"illumination right 200, HE add 100.,

Once the FO has adjusted the illuminating shell to the desired

location, he should control the rate of fire and the number of pieces

5-45
5-46

firing. He should reduce the ammunition expended to the minimum

required for observation.

a. Fire Direction Center Control. The FO allows the FDC to

control firing of both illumination and HE by announcing

"coordinated illumination" in his call for fire. While adjusting the

illumination to yield the best light on the target, the FO should

announce "illumination mark" to the FDC to notify it of the exact

time when the target is best illuminated. Several marks may have

to be established because a new mark must be established each

time the illumination is corrected. By marking the adjusting

rounds, the FO avoids the need for a separate illumination round to

mark. The FDC times the interval between the actual firing of the

illuminating round and the receipt of the FO's "illumination mark."

By comparing this time interval with the TOF of the HE, the FDC

can control the firing of the HE rounds so that they arrive at the

target during the period of maximum illumination. If the FO

adjusts the illuminating fire and the HE fire concurrently, he begins

corrections pertaining to illumination with the word "illumination"

and those pertaining to HE with "HE."

b. Observer Control. As an alternate method, the FO may request

"coordinated illumination" and announce the method of control as

"by round at my command" for both missions. This indicates that

both HE and illumination will be fired only at the FO's command.

In this method, the observer is responsible for timing his own mark

and incorporating the HE TOF into the delivery of fires. As soon as

the FDC reports that the illumination and HE fires are ready, the

FO commands the firing of illumination. Then the FO commands
the firing of the HE so that it will impact during maximum

illumination of the target. The FO must request the HE TOF to

better coordinate the firing of each round. An experienced FO and

battery may be able to adjust more than one HE round under each

round of illumination.

5605. Continuous Illumination. Because of the amount of

ammunition expended, the least desirable method of coordinated

illumination is for the FO to request "continuous illumination." In

this technique, the FDC fires illumination continually (intervals

between firing depend on the type of projectile) while the FO

adjusts the HE. This is acceptable when illumination is enhancing

the performance of optics in acquiring direct-fire targets.

Section VII. Smoke

The main objective of employing smoke is to create a one-way

mirror so that forces may attack but not be seen by the enemy.

Smoke is a combat multiplier that can be used in many ways to

help accomplish the mission. Smoke can conceal both friendly and

enemy troop movements, slow attacking forces, disrupt command

and control, and reduce exposure of critical friendly and enemy

assets. Observers must synchronize, integrate, and sustain smoke to

defeat enemy electro-optical systems. Smoke at the critical time

and place helps the combined-arms team to accomplish its mission.

The force that most effectively employs smoke and functions better

in limited visibility has the advantage in battle.

5-47
5-48

5701. Categories of Smoke. Smoke is categorized as deliberate or

hasty.

a. Deliberate. Deliberate smoke is normally employed at the

regimental level or higher. Any smoke source can provide

deliberate smoke. Deliberate smoke can conceal forces or protect

large areas (several square kilometers) behind the forward line of

troops with smoke generators supplemented by smoke pots. This

requires large amounts of fuel, fog oil, and munitions as well as

extensive use of artillery assets and scarce smoke generators. Point

or small-area targets can be obscured by other smoke assets

(artillery, mortars, NGF, and air-to-ground rockets).

b. Hasty. Smoke in hasty operations is often used by battalions

and smaller units against immediate tactical threats. Hasty smoke

employs the unit's basic load of smoke-producing sources in

addition to rapid-response assets like mortars and artillery. These

operations typically require short planning and execution times,

minimal coordination, relatively short duration of effects, and the

use of organic assets. Hasty smoke obscurants are created to

support small-unit maneuver or disengagement. Units must

carefully plan the operational and logistical support for using hasty

smoke.

5702. Battlespace Applications. The battlespace applications for

using smoke in deliberate and hasty operations are obscuring,

screening, marking, and/or deceiving.
a. Obscuring. Obscuring smoke is used to degrade the enemy's

combat effectiveness. Obscuring smoke is placed on or near the

enemy to suppress enemy observers and to minimize their vision

andlor their ability to command and control their forces.

b. Screening. Screening smoke is used to conceal friendly forces,

positions, and activities from enemy ground or air observation.

Screening smoke is normally placed between friendly and enemy

forces.

c. Marking. Marking smoke is used to identify targets for aircraft,

to identify friendly locations, or as a navigational aid. It can also be

used to signal prearranged battlespace cues.

d. Deceiving. Deceiving smoke is used to mislead the enemy about

friendly force intentions. Deceiving smoke can support the

deception plan by thawing attention away from the main effort

5703. Delivery Systems

a. Mortars. Mortar units can deliver a high volume of smoke at

short to medium ranges. Mortars generally provide the most rapid

and responsive fires for the commander. The various types of

mortar smoke include WP and red phosphorus (RP). (See table 5-3

on page 5-50.)

5-49
5-50

Table 5-3. Smoke Munitions Data.

Delivery

System

Type of

Round

Time To

Build

Effective

Smoke

Average

Burning Time

Average Obscuration

Length (m!Round)

Crosswind

Headwind!

Tailwind

155 mm

HC 1 - 1% mm 4 mm 350 75

WP 1⁄2 mm 1 - 11,4 mm 150 50

M825 1⁄2 mm 5 - 8 mm 350 100 - 200

81 mm

WP 1/2 mm 1 mm 100 40

RP 1/2 mm 1% -2 mm 90- 150 40-50

60 mm WP 1/2 mm 1 mm 75 40

5-inch/54 WP 1/2 mm i mm 150 40

Note: Planning factors are meteorologically dependent. Data is based on

favorable conditions.

(1) White Phosphorus Smoke. WP is available from company

mortars (M224 60 mm) and battalion mortars (M252 81 mm).

Mortar WP produces rapid smoke buildup, but its effects are of

limited duration. It can be used for marking targets.

(2) Red Phosphorus Smoke (M819). RP is a time-fuzed round

that contains RP smoke pellets. At a preset time along theround's

trajectory, the fuze functions to expel and ignite the RP pellets at

an approximate HOB of 175 meters. The burning pellets produce a

cloud of dense smoke after hitting the ground. A three-round

volley is required to develop the basic smoke screen. RP smoke is

available from 81-mm mortars only.
b. Artillery. Various smoke munitions can be fired by cannon

artillery. The artillery provides smoke at short, medium, and long

ranges. Artillery units can provide longer, more effective smoke

effects than the mortar platoons. However, excessive use of smoke

should be planned and coordinated so that artillery units can meet

the commander's needs. The types of artillery smoke are

hexachioroethane (HC), WP, and M825 improved smoke

(felt-wedge WP). (See table 5-3.)

(1) White Phosphorus Smoke. This type of artillery smoke

involves a canister filled with WP. It is either PD or time fuzed. It

is the primary marking round and builds quickly but has little

sustainment. With a time fuze, it disperses more for obscuring. It is

not fired with fuze VT.

(2) Hexachloroethane Smoke. HC is time fuzed and functions at a

HOB of approximately 50 meters. The HC smoke canisters are

expelled from the projectile and disperse in the target area. It is

slow building but is effective for screening.

(3) M825 Improved Smoke. M825 has replaced HC smoke

rounds. It is a canister filled with WP-impregnated felt wedges that

are expelled from the base. It is time fuzed and functions at a

predetermined HOB that varies with the propellant and charge

fired. The wedges build rapidly into an effective screen with

lasting duration.

5-51
5-52

Note

Soft sand or mud can prevent wedges from completely burning; this poses a

nonlethal hazard to maneuvering forces when wedges are reexposed to air.

5704. Smoke Planning Considerations. The factors to consider

when planning smoke are weather, terrain, means available,

ammunition, the enemy, and command and control. On the basis of

these factors, the FO can advise the company commander on the

feasibility or likely performance of smoke.

a. Weather. Weather aspects are interrelated. The wind,

temperature gradient, humidity, precipitation, and cloud cover will

indicate the effectiveness of smoke and the volume required. Wind

speed and direction are the primary factors in smoke performance.

(1) Wind Speed. Wind speed indicates whether smoke will be

effective. High winds push smoke down, and effective smoke will

not thicken until it has blown farther downwind. Low winds allow

smoke to billow high and thicken closer to its source. Figure 5-21

on page 5-53 shows the optimal wind speeds for smoke. The

equivalent wind-speed scale, the grass drop/flag method, and the

onboard computer of the M1A1 are valid methods to determine

wind speed.

(a) Equivalent Wind Scale. The observer can use table 5-4 on

page 5-53 to determine wind speed. It is the least accurate and

most subjective of all of the methods.
Wind Speed (Knots)

0 5 10 15 1H1H11

HCSmoke I I

Best for Smoke —

20 II

I__

Effective Marginally Effective Ineffective

Figure 5-21. Optimal Wind Speeds.

Table 5-4. Equivalent Wind-Speed Scale.

Knots Observation

1 Smoke, vapor from breath, and dust raised by vehicles or personnel

rise vertically. No leaf movement.

1 - 3 Direction of wind slightly shown by smoke, vapor from breath, or dust

raised by vehicles or personnel. Slight intermittent movement of

leaves.

4 - 6 Wind slightly felt on face. Leaves rustle.

7 - 10 Leaves and small twigs in constant motion.

11 - 16 Wind raises dust from ground. Loose paper and small branches move.

17 -21 Small trees with leaves sway. Coastal wavetets form on inland waters.

22 - 27 Large branches on trees in motion. Whistle heard in telephone or

fence wires.

28 - 33 Whole trees in motion. Inconvenience felt walking against wind.

(b) The Grass Drop Method or FJag Method. The grass drop and

flag methods are better ways to determine wind speed. Extend the

arm downwind and parallel to the ground. Drop some grass from

5-53
5-54

the hand and point to the grass on the ground. Estimate the angle

formed by the arm and torso, in degrees, and divide by four to

determine wind speed in knots. The flag method is similar. Use a

flag or lightweight strip of cloth attached to a vertical object.

Estimate the angle of the flag/cloth and the vertical object, in

degrees, and divide by four to determine wind speed in knots.

(c) Onboard Computer of the M1A1 Tank. The observer uses

the onboard computer to determine the wind speed at the tank

location. This is the most accurate method of wind measurement.

(2) Wind Direction. Computations are used to determine the

local-area wind direction. Local-area wind direction indicates

where the smoke will travel. Wind direction is measured as a

horizontal clockwise angle, in mils, from grid north. It extends

from the direction from which the wind is blowing to the direction

to which the wind is blowing. A field-expedient method of

determining wind direction is to face away from the wind and

measure the actual wind direction with a compass.

(3) Temperature Gradient. Temperature alone has no direct

impact on the effectiveness of smoke. Temperature gradients do,

however, directly affect smoke performance. Temperature

gradients are determined by comparing air temperatures at 0.5

meters and four meters. Unstable, neutral, and stable are the three

general temperature gradients used. Table 5-5 on page 5-55 is used

for predicting these conditions and how the smoke will perform

under these conditions.
Table 5-5. Temperature Gradients.

Smoke

. Condition

(Temperature)

ra en, i

Time of Day

Weather Conditions

Expected Smoke

Behavior as The

Smoke Drtfts

. Downwind

(Wind Direction —0.)

. (Inversion)

1. Night - Until 1 hour after sunrise.

2. Wind speed less than 5 kts.

3. Sky cover less than 30 percent.

ALL ThREE CONDITIONS

MUST BE MET.

'' —

Stable condition - Favorable

for smoke employment.

MODERATELY

FAVORABLE

(Neutral)

This condition occurs most often

1-2 hours before and after sunrise

and when the wind speed is 5 kts

or more and/or the sky cover is 30

percent or more,

- ,

'

Neutral condition - Moderately

favorable for smoke employment.

MARGINAL

(Lapse)

1. Day - beginning 2 hours after sunnse. 2. Wind speed less than 5 kts.

3. Sky cover less than 30 percent.

ALL ThREE CONDITIONS

MUST BE MET. - (r . . Unstable condItion - marginal

for smoke employment.

(a) Unstable conditions exist when the air temperature decreases

with an increase in altitude. An unstable condition is characterized

by vertical air currents and turbulence. Smoke tends to break up

and become diffused under these conditions. Unstable conditions

should be considered by planners as marginal for smoke

employment.

(b) Neutral conditions exist when an increase in altitude is

accompanied by little or no change in air temperature. Limited

vertical air currents also cause neutral conditions when the wind

5-55
5-56

speed is greater than five knots. Planners should consider neutral

conditions as moderately favorable for smoke employment.

(c) Stable (inversion) conditions exist when the air temperature

increases with an increase in altitude. This condition greatly limits

vertical air currents. Smoke produced during inversion conditions

lies low to the ground and may reduce visibility at ground level.

Stable (inversion) conditions should be considered favorable by

planners for smoke employment if there is enough wind to carry

the smoke over the target area.

(4) Humidity. WP, RP, and HC smoke are hygroscopic and

produce smoke particles that absorb moisture from the air.

Moisture increases particle size and density and makes the smoke

more effective. Smoke munitions generally produce denser, thicker

smoke in high humidity than in low humidity. High humidity is

generally favorable for smoke employment.

(5) Precipitation. Precipitation is a natural obscurant. Using

smoke in mist or fog produces thicker smoke that is more effective

against electro-optical systems. Light rain produces moderately

favorable conditions for using smoke because the smoke might not

rise high enough to produce effects. Heavy rain and snow are

effective natural obscurants themselves and will degrade

electro-optical systems effectively. As a general rule, precipitation

pushes smoke down to the ground and spreads it over larger areas.

(6) Cloud Cover. Clouds will give an indication of how smoke

will perform in the baulespace. As a general rule, the atmosphere is
stable (favorable) when the sky is covered with clouds. Scattered

clouds indicate moderately favorable conditions. No cloud cover

indicates marginal conditions.

b. Terrain. Winds follow the contours of the Earth. The type of

terrain over which smoke travels has a tremendous effect on how

the smoke will cover a specific area. Flat, unbroken terrain creates

effective smoke farther downwind. Trees and small buildings tend

to break up smoke, which may then reform to cover a larger area

and create effective smoke near the source. Steep hills or

mountains create volatile winds, usually resulting in gaps and

uneven smoke. Slopes and valleys create thermal slope winds at

different times. Heating effects during the day cause up-slope

winds. Cooling effects at night cause down-slope winds. Table 5-6

on page 5-58 summarizes atmospheric and terrain effects on smoke

operations.

c. Means Available. Observers recommend to maneuver

commanders the best means of providing smoke. Higher level

FSCCs must review and then approve, modify, or deny this request

on the basis of the effects of the smoke on all maneuvers.

d. Ammunition. Smoke ammunition is a limited asset. Because

ammunition requirements vary with each mission, observers

should know the amount and types of smoke ammunition available

and how many minutes of coverage it can provide. Extensive,

planned smoke employment should be coordinated early with

firing units to allow for redistribution or requisition of ammunition.

5-57
5-58

Table 5-6. Terrain and Atmospherics.

Factor Unfavorable Moderately

Favorable Favorable

Wind More than 10

knots

Less than five

knots

5 to 10 knots

Atmospheric

stability category

Unstable (lapse)

(favorable for

smoke curtain)

Neutral Stable (inversion)

(unfavorable for

smoke curtain)

Humidity Low Moderate High

Precipitation None Light rain Mist/fog

Cloud cover None Scattered Overcast, low

ceiling

Terrain Even Gently rolling Complex

topography

Vegetation Sparse or none

(desert)

Medium to dense Heavily wooded or

jungle

Time of day Late morning

through late

afternoon

Mid-morning 1 hour before

EENT to 4 hours

after BMNT

Legend:

BMNT = beginning of morning nautical twilight

EENT = end of evening nautical twilight

e. The Enemy. When considering smoke employment, the

enemy's electro-optical capability should be known and likely

positions for his weapons systems and observers that may threaten

friendly forces should be anticipated. On the basis of the

commander's plan, observers should determine when smoke

employment will enhance friendly operations and hinder enemy

operations.
f. Desired Effects. Clearly stated guidelines, restrictions, desired

effects against enemy electro-optical systems, and other smoke

employment instructions should be part of the commander's

guidance and unit SOPs. Desired effects are specified as visible or

infrared. All types of smoke are capable of producing visible and

infrared effects. Table 5-7 on page 5-60 shows the effectiveness of

the types of smoke against enemy and friendly electro-optical

systems. Figure 5-22 on page 5-61 shows the effectiveness of all

types of obscurants against enemy and friendly electro-optical

systems.

(1) Visible. The visible wavelength is relatively easy to defeat with

smoke. Obscurants hinder enemy viewers such as binoculars,

weapons sights, night observation sights, and laser rangefinders.

Smoke can also degrade friendly visibility. Smoke that is sufficient

to degrade less sophisticated electro-optical systems may be

relatively ineffective against more sophisticated electro-optical

systems. Infrared device-equipped observers have an inherent

tactical advantage over observers who rely solely on the visible

wavelength. With infrared devices, observers can more easily

acquire targets through smoke, although positive target

identification is more difficult.

5-59
5-60

Table 5-7. Smoke Effects on Electro-optical Systems.

Spectral Region Electro-optical System Type of Smoke

Visible

0.40 - 0.75pm

Viewers:

• Daylight sights

• Naked eye

• Camera lens

• Binoculars/standard optics

• Battlespace television

• Manual command to line of sight

(MCLOS) missiles (AT.3)

• Night sights

All

Near infrared

0.75 - 4pm

Viewers:

• Semiautomatic command to line of

sight (SACLOS) missiles (AT-4

and AT.5)

• Night sights

All

Sensors:

• Laser designators

• Laser rangefinders

All

Mid infrared

4 - l4pm

Viewers:

• Passive thermal sights

WP, RP, type Ill

infrared obscurant,

dust

Far infrared

14 - 100pm

Sensors:

• Thermal imagers

• Terminal homing missiles (AT.6)

WP, RP, type Ill

infrared obscurant,

dust

Millimeter wave

and

lower frequency

1.00mm

Radar

Radio

Microwaves

WP, developmental

obscurants

X-ray and higher

frequency

Directed electromagnetic pulse

Nuclear weapons

Oil smoke

(attenuation only),

developmental

obscurants
Figure 5-22. Obscurant Effects on Electro-optical Systems.

(2) Infrared. Visual obscurants may degrade the visibility of

observers using infrared devices. Bispectral obscurants, however,

can defeat sophisticated battlespace viewers and weapon guidance

systems such as command line-of-sight or terminal homing

systems on antitank missiles. Bispectral obscurants defeat or

degrade both the visual and infrared portions of the

electromagnetic spectrum simultaneously. Firing units employing

5-61

Spectral Region

0.4ijm 0.75pm 4.0m 14.Oum 1.0mm

I I I I I II

Obscurant

SGF-2 (Fog Oil)

HC Smoke Mixture

wP,RP

Type III IR

Oust

Fog

Functions _____________________ Acquisition

Missile _______________ Guidancel

Control

Designate/Range

Nigh Energy Source

Radar Thennal Optical 12 TV Thermal Active Guidan Units SeeKers Seekers

Leqend

12 Image Intensifier

SGF-2 = Smoke Generator for Number 2

urn micrometer

1000in=1 mm

IR = Infrared

Obscurant Sifectivertess Scale: Very Effective

Partially Effective

I I Slightly Effective
5-62

bispectral fires deliver sufficient amounts of smoke to degrade less

sophisticated as well as advanced electro-optical systems as

necessary. Like visual obscurants, bispectral obscurants can

degrade both enemy and friendly systems. Bispectral obscurants

are required to defeat an enemy that is equipped with more

sophisticated electro-optical technology.

5705. Types of Smoke Missions. Immediate smoke and quick

smoke are the two types of smoke missions that are fired by the

artillery and mortars.

a. Immediate Smoke. Immediate smoke provides obscuring,

protecting, or marking smoke over small areas. It is more

respçnsive than quick smoke, but the duration and area of effects

are limited. Immediate smoke is effective against point targets for

short periods. Unit SOPs should state the amount and type of

ammunition to be fired and the number of guns to be used.

(1) Adjusting Point. The adjusting point for immediate smoke is

normally the target itself. However, the observer may determine

that offsetting his adjusting point into the wind may produce better

obscuration. When offsetting the adjusting point, use the criteria

listed in figure 5-23 on page 5-63.

(2) Requesting Immediate Smoke. The call for fire for immediate

smoke consists of four elements sent in one transmission. The four

elements are observer identification, warning order, target location,

and transmission authentication.
Legend

MTL ManeuverTarget Line

S = Short

UW = Upwind

Figure 5-23. Optional Adjusting Points for Immediate Smoke.

(a) Observer Identification. The observer's call sign identifies

him to the FDC.

5-63

Maneuver Force

WindOirection

Observer 4400 m*

MTL

Crosiwind Target lOOm

at Which 'I s Smoke is Placed

Placing Smoke in a Crosswind

Tailwind—+

Point at Which

Smoke Is Placed Observer

Placing Smoke in a Tailwind
5-64

(b) Warning Order. The observer announces "immediate smoke."

(c) Target Location. Any method of target location may be used.

(d) Transmission Authentication. Proper transmission

authentication at the end of the call for fire is required.

Example (Grid)

FO: "W52 this is H24, immediate smoke, grid 628 545, I authenticate

ROMEO DELTA, over."

FDC: (Reads back.)

Example (Shift From Known Point)

FO: "W52 this is H24, immediate smoke, shift target number AB3058,

direction 4360, left 130, add 300, I authenticate MIKE LIMA, over."

FDC: (Reads back.)

Example (Polar)

FO: 'W52 this is H24, immediate smoke, polar, direction 4360, distance

2700, up 30, I authenticate PAPA KILO, over."

FDC: (Reads back.)

Example (Laser Polar)

FO: W52 this is H24, immediate smoke, laser polar, direction 4362, distance

2730, vertical angle plus 11, I authenticate CHARLIE ALFA, over."

FDC: (Reads back.)

b. Quick Smoke. Quick smoke provides obscuring, screening, or deceiving smoke over larger areas. More planning and

coordination are required for quick smoke than for immediate

smoke. Smoke rounds for quick smoke missions are fired in a
linear sheaf and cover larger areas than are covered by immediate

smoke missions.

(1) Planning Quick Smoke Missions. Quick smoke is effective

against enemy positions and formations. A standard call for fire

includes target location, target description, length of the sheaf,

direction of the maneuver-target line (MTL), direction of the wind

in relation to the MTL, desired time, and duration and effects of

the smoke. Fire for effect should be requested for planned targets

or refined target locations. Adjust fire can be conducted when the

method of target location is less accurate. When adjusting fire,

provide OT direction for grid missions.

(a) Target Location. Any method of target location may be used.

The target location is the center of the area where the screen needs

to be most effective. Note that adjusting rounds are delivered to

where the screen is planned. However, during the fire for effect,

smoke rounds will be offset by the FDC for the effects of wind.

(b) Target Description. Announce "screen" followed by an

accurate target description. "Screen" alerts the FDC that smoke

mission data will follow. Target descriptions such as open area,

tree line, or hilltop are inappropriate. If the enemy situation is

vague or unknown, transmit a description of the suspected target

for screening.

(c) Length of the Smoke Sheaf. In coordination with the

commander, determine the area to obscure, screen, protect, or

deceive. The actual length of the smoke sheaf in meters is then

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determined. A recommendation should then be made to the

commander regarding the length of the sheaf and the weapons

system that should be used.

(d) Determining the Maneuver-Target Line. The MTL is a

horizontal clockwise angle measured from grid north. Depending

on the situation, the MTL can extend from the observer's location

to and through the target, or it can extend from the most vulnerable

point along the route of march to and through the target. The MU

is determined to an accuracy of 10 mils.

(e) Determining the Wind Direction in Relation to the

Maneuver-Target Line. Determine whether the wind is a right

crosswind, left crosswind, headwind, or tailwind in relation to the

MTL. A left crosswind blows from left to right across the MTL

from the observer's perspective. A right crosswind blows from

right to left across the MTL from the observer's perspective. A

headwind blows along the MTL toward the observer. A tailwind

blows along the MTL away from the observer. Figure 5-24 shows

how to convert the wind direction in relation to the MTL to a right

crosswind, left crosswind, headwind, or tailwind. To compute the

difference between the actual wind direction and the direction of

the MTL, see figure 5-24 on page 5-67.

(1) Desired Time and Duration of Smoke Effects. Consult with

the commander to determine how long the smoke effects are

required. In the offense, the duration of required smoke effects is

based on the friendly unit's average rate of speed and the distance

of the friendly movement. In the defense, it is based on the
enemy's closure rate and the distance that he needs to cover before

he can be effectively engaged.

Figure 5-24. Determining Wind Direction in Relation to the

Maneuver-Target Line.

(g) Desired Smoke Effects. Announce "smoke" or "infrared

smoke" to describe the desired effects of the smoke mission.

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Right Crosswind

Tailwind
5-68

"Smoke" is a request for visible effects. "Infrared smoke" is a

request for infrared effects.

(h) Feasibility. During planning, the observer can provide mission

information to the FDC and allow it to compute the number of

rounds required for support. This allows feasibility assessment, as

well as ammunition preparation. The FDO will select the

appropriate smoke munition that will produce the requested effects.

(2) Requesting Quick Smoke. Quick smoke is requested by using

the six elements of the standard call for fire. These elements are

sent in three transmissions.

(a) Observer Identification. This identifies the observer to the

FDC.

(b) Warning Order. Announce "fire for effect" or "adjust fire."

(c) Target Location. Use any of the four methods of target

location.

(d) Target Description. Announce "screen" followed by the actual

or suspected target description.

(e) Method of Engagement. Announce the length of the smoke

sheaf, MTL, direction of the wind in relation to the MTL, and

desired time and duration of smoke effects. Use the memory aid

"L-M-Dir-T," which stands for the following:
• L—length of the linear smoke sheaf

• M—MTL direction

• Dir—direction of the wind in relation to the MTL

• 1—desired time and duration of smoke effects in minutes.

(Following this, announce either "smoke" or "infrared smoke.")

(1) Method of Fire and Control. Method of fire is not normally

requested. However, any method of control can be specified based

on the tactical situation.

Example (Grid Method)

FO: "W52 this is H24, adjust fire, over."

FDC: (Reads back.)

FO: "Grid 617 538, over."

FOC: (Reads back.)

FO: Screen T-55 company dug in, length 600, MTL 1850, right crosswind,

five minutes, smoke in effect, over."

FDC: (Reads back and challenges.)

FO: (Replies.)

FDC: (Announces Mb.)

FO: (Reads back MTO.)

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5-70

Example (Shift Method)

FO: UR5M this is M24, fire for effect, shift target number AB3062, over."

FDC: (Reads back.)

FO: "Direction 4570, right 280, add 400, down 35, over."

FDC: (Reads back.)

FO: Screen suspected combat OP. length 200, MTL 0120, left crosswind,

five minutes, infrared smoke, over."

FDC: (Reads back and challenges.)

FO: (Replies.)

FDC: (Announces MTQ.)

FO: (Reads back Mb.)

Example (Polar Method)

FO: "W5H this is H24, fire for effect, polar, over."

FDC: (Reads back.)

FO: "Direction 4420, distance 2700, up 45, over."

FDC: (Reads back.)

FO: "Screen BRDM-2 with AT-5, length 200, MTL 5240, tallwind, 10 minutes,

infrared smoke, time on target 0615, over."

FDC: (Reads back and challenges.)

FO: (Replies.)

FDC: (Announces MTO.)

FO: (Reads back MTO.)

Example (Laser Polar Method)

FO: W5H this is H24, fire for effect, laser polar, over."

FDC: (Reads back.)

FO: "Direction 4514, distance 4170, vertical angle plus six, over."

FDC: (Reads back.)

FO: "Screen BMP-2 platoon with AT-5s, length 400, MTL 4510, headwind, 10

minutes, infrared smoke, at my command, over."

FDC: (Reads back and challenges.)

FO: (Replies.)

FDC: (Announces MTO.)

FO: (Reads back Mb.)
(3) Adjustment Procedures for Quick Smoke. Shell HE is used

in adjustment for quick smoke missions. HC smoke adjusts the

HOB before firing for effect, but M825 does not. When firing HC

smoke, request "smoke" when splitting the 200-meter bracket

(within 100 meters of the target). After observing the smoke round,

apply a HOB correction and fire for effect. When firing M825

smoke, the same adjustment procedures as for DPICM are used.

No HOB adjustment rounds are necessary; fire for effect when

splitting the 200-meter bracket. Carefully analyze the behavior of

the smoke to ensure effective smoke coverage. Make deviation,

range, and HOB corrections from the center of the smoke sheaf as

required. Because the smoke will cover a larger area, minimum

corrections are as follows:

• Deviation—leftlright 50 meters

• Range—addldrop 100 meters

• HOB—up/down 50 meters.

(a) Adjusting White Phosphorus Smoke. WP is adjusted for

range and deviation only when it is fired with a PD fuze. When it is

employed with a time fuze, it is adjusted for ROB to 20 meters.

(b) Adjusting Hexachioroethane Smoke. Range, deviation, and

ROB corrections are sent when necessary. Range and deviation

correction criteria are used as previously stated. The following

automatic corrections are used for adjusting HC-smoke HOB:

• Ground burst—up 100

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5-72

• Bouncing canisters—up 50

• Canisters too spread out—down 50.

(c) Adjusting M825 Improved Smoke. Range, deviation, and HOB corrections may be sent when necessary. Range and

deviation corrections are used as previously stated. However,

M825 improved smoke rarely requires HOB corrections. If the

observer spots the M825 as graze, he must immediately announce

"graze" to the FDC. The FDC must verify that the firing data were

correct. HOB corrections for M825 smoke are announced in

50-meter increments. The following HOB corrections will be used

for M825 smoke:

• Graze/firing data correct—up 100

• Thick/dense separated clouds—up 50

• Thinluneven clouds—down 50.

(d) Adjusting Red Phosphorus Smoke. Range, deviation, and

HOB corrections may be sent when necessary. Range and

deviation corrections are used as previously stated. However, RP

rarely requires HOB corrections. Use the M825 HOB adjustment

criteria for RP smoke.

5706. Safety Considerations. HC smoke is carcinogenic. All

types of phosphorous munitions produce phosphoric acid, which is

poisonous. Personnel must wear respiratory protection (e.g.,

protective masks) when operating in HC smoke and while exposed

to phosphorous smoke. M825 felt wedges and RP smoke pellets
sometimes do not burn completely. This is referred to as "crusting

over." Crusted-over felt wedges and pellets will reignite when

disturbed and could cause serious bums. Personnel should be

warned of their use in the area or areas that they will occupy.

Section VIII. Artillery and Mortar Final Protective Fires

FPF is "an immediately available prearranged barrier of fire

designed to impede enemy movement across defensive lines or

areas." (Joint Pub 1-02) FPFs consist of final protective lines

(FPLs) and principal directions of fire (PDFs) from direct-fire

weapons and continuous indirect-fire barrages. In artillery, a

battery is assigned one FPF. In mortars, an FPF may be assigned to

a squad, a section, or the platoon. The size of the FPF depends on

the type and number of weapons. (See table 5-8.) Once assigned

the FPF, the firing unit remains laid 'on that data in between

missions and prepares ammunition. A unit cannot be laid on both

an FPF and a priority target.

Table 5-8. Final Protective Fires.

Weapon Size (m)

60-mm mortar

Section (3 tube) 60 x 30

81-mm mortar

Platoon (8 tube)

Section (4 tube)

Weapon (1 tube)

280 x 35

140 x 35

35 x 35

155-mm howitzer

Battery (6 gun) 300 x 50

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5801. Employment of Final Protective Fires. The location of

FPF normally is designated by the supported commander for

whom it is being planned. It may be any distance from the friendly

position that supports the current tactical situation within range of

organic direct-fire weapons. This is normally within 200 to 400

meters (danger close). The importance of accurate defensive fires

and the danger close situation usually requires that each weapon

firing the FPF be adjusted into place, if possible.

5802. Final Protective Fire Procedures. FPF can be either

adjusted or nonadjusted. Considerations include the tactical

implications of adjusting the FPF (loss of surprise) versus the

accuracy that is acquired for firing close to friendly troops. If

adjusting, the initial target location sent is not the location of the

center of the FPF but a grid that is a safe distance (400 to 600

meters) from friendly troops. Because this grid is part of a final

defensive plan, it should be encrypted. The call for fire is similar to

the normal call for fire with the exception of the third transmission.

The attitude or direction of the long axis of the FPF is announced.

In target description, "final protective fires" is announced. "Danger

close" is announced in the method of engagement. "Fuze delay"

should be requested whenever possible to minimize the safety

hazard to friendly units while providing close-in fires.

a. Executing the Final Protective Fire. Once established, the FPF

is initiated by the company commander. The observer fires the

artillery FPF, using an established code or announcing "fire the

FPF" with the appropriate authentication. To halt firing of the FPF,
the command "cease loading" or "check firing" is given. To

terminate the FPF, "cancel FPF" is announced.

b. Adjusted Final Protective Fires

(1) Manual Fire Direction Centers. The procedures for mortar

FDCs and manual artillery FDCs are the same. The entire battery

or mortar platoon fires one round (a battery/platoon one volley)

centered on the initial grid sent by the FO. If the rounds impact as

shown in figure 5-25, the FO begins his adjustment with the flank

piece impacting closest to the FPF line (in this case, number 1).

Creeping fire adjustment procedures must be used in danger close

situations. The following is an example of the first correction.

Example

"Number 1, right 100, drop 50, over."

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Figure 5-25. Adjustment of Final Protective Fires.
5-76

Corrections are made and fired until the FO believes that he can

make a final correction to within 50 meters of the FPF line. The

FO then sends a final correction, states that the weapon is adjusted,

and calls for the next weapon to be adjusted. This final adjustment

of 50 meters or less is computed and recorded but not fired. (See

figure 5-26.)

Example

"Number 1, drop 30, number 1 is adjusted, number 2, repeat, over."

"H12 this is H18, adjust fire, over."

(FDC reads back.)

'Grid 6732 8674, altitude 710, over." (Encoded when not radio encrypted.)

(FDC reads back.)

"Final protective fire, attitude 1900, danger close, delay, over."

(FDC reads back.)

(The unit fires a battery one round with a sheaf as shown in figure 5-25. The

FO observes that gun number 1 is closest to the FPF line and begins

adjustment with number 1.)

Direction 0810, number 1, right 100, drop 50, over."

(FDC reads back.)

(The unit fires the adjustment, and the FO believes that he can make a final

correction to within 50 meters of the FPF line.)

"Number 1, drop 30, number 1 is adjusted, number 2 repeat, over."

(FDC reads back.)

(The FDC makes this adjustment, records the adjusted data as the priority

target for gun number 1 but does not fire this adjustment, then fires gun

number 2. This procedure is continued until all guns are adjusted.)

Figure 5-26. Example of Adjusted Final Protective Fires

Mission with Manual Fire Direction Center.
(2) Automated Fire Direction Centers. If the artillery FDC is

automated, only the center weapon will be adjusted onto the center

grid of the FPF. The procedure is the same as for an adjust-fire

mission. (See figure 5-27.) All corrections are automatically

applied to the other weapons without firing. Note that "end of

mission" ends the adjustment phase. "Cancel FPF" is used to

terminate the FPF.

Exam pie

'Right 20, drop 50, end of mission, over."

"H12 this is H18, adjust fire, over."

(FDC reads back.)

"Grid 5784 4893, altitude 475, over." (Encoded when not radio encrypted.)

(FDC reads back.)

"Final protective fire, attitude 1900, danger close, VT, over."

(FDC reads back.)

(The unit fires one round with a selected howitzer. The FO observes and

corrects the round just as in adjust-fire missions. The round represents the

center of the linear sheaf.)

"Direction 0810, left 80, drop 50, over."

(FDC reads back.)

(The unit fires the adjustment, and the FO believes that he can make a final

correction to within 50 meters of the FPF line.)

"Right 20, drop 50, end of mission, over."

(FDC reads back.)

(The FDC processes this adjustment but does not fire. Data is then

determined for all howitzers. The data is passed to all howitzers, which

remain laid on the FPF when not engaged in other missions.)

Figure 5-27. Example of Adjusted Final Protective Fires

Mission with Automated Fire Direction Center.

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c. Nonadjusted Final Protective Fires. In some instances, the

tactical situation dictates against adjusting the FPF. In these cases,

it is essential for the FDC to be automated. If this is not possible,

then the observer should consider the proximity of the FPF to

friendly troops. The FO will then establish the FPF and give the

FPF location, including altitude and attitude. (See figure 5-28.)

"H12 this is H18, fire for effect, polar, over."

(FDC reads back.)

"Direction 3160, distance 400, down 20, over." (encoded when not radio

encrypted)

(FDC reads back.)

"Establish as final protective fire, attitude 1900, danger close, delay, over."

(FDC reads back.)

(The FDC processes the mission and transmits data for the guns to lay on

without firing.)

Figure 5-28. Example of Nonadjusted Final Protective Fires

Mission.

d. Laser Final Protective Fires. Laser FPFs are nonadjusted

FPFs. They are similar to laser draw missions with one major

difference—unlike laser draw missions, the lased points of the FPF

each represent a howitzer aim point. The number of aim points

must match the number of howitzers. Note that it is possible to

create gaps in the FPF "wall of steel" with a laser FPF. Each point

is lased and transmitted to the FDC as polar data or converted to a

grid. (See figure 5-29 on page 5-79.)
"H12 this is H18, fire for effect, laser draw, over."

(FDC reads back.)

uDirection 1562, distance 380, vertical angle plus three, over." (Encoded when

not radio encrypted.)

(FDC reads back.)

(Direction, distance, and vertical angle to remaining points are transmitted

and read back by FDC.)

"Establish as final protective fire, danger close, VT, over."

(FDC reads back.)

(The FDC processes the mission and transmits data for the guns to lay on

without firing.)

Figure 5-29. Example of Laser Final Protective Fires Mission.

Section IX. Nonstandard Procedures for Artillery and Mortars

5901. Adjustment of Fires by Sound. During operations in which

FO visibility is limited, fire may be adjusted by the use of sound

alone. Target location may be reported to the FO by the supported

unit or may be determined by the FO. If the FO can hear noises at

the enemy position (e.g., weapons firing, vehicles, or troop movements), he can estimate a direction and distance from his

position.

a. Procedures. The P0 must alert the FDC when he is going to

adjust by the use of sound. The FO must determine his location

and ensure that the battery FDC has it plotted. The FO then

determines the direction to the target and selects a target grid along

the direction to the target. He then sends a call for fire using that

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direction and target grid. On hearing the burst of the adjusting

round, the FO estimates the direction to the burst and compares it

with the direction to the target. The P0 converts the deviation to a

lateral shift in meters. Distance to the adjusting point is difficult to

judge; therefore, the FO may have to use creeping techniques to

adjust onto the target. The FO can determine distance by

measuring the time it takes for the sound of the burst to reach him

and multiplying the time interval by the speed of sound (350

meters/second). To help the P0 determine distance accurately, the

FDC must announce the precise moment of impact, for example,

"splash."

b. Employment Considerations. The following should be

considered when adjusting fires by sound:

• The FO must exercise caution in very broken terrain. In hills or

mountains, the sound may travel around a hill mass before it

arrives at the FO's position and may produce a false direction to

the burst.

• If the FO's position is inaccurate, the initial round will be

inaccurate. The initial round can be used to determine a

resection.

• The P0 may consider using a WP round with a 200-meter HOB

as the first round in adjustment.

• To increase accuracy in adjustments using sound, the FDC may

take the adjustments from two or more FOs.
• Aerial observers may be used to assist the ground observer in

making adjustments.

5902. Multiple Missions. Contact with the enemy may be so

intense that the FO must transmit two or more calls for fire and

adjust all missions simultaneously. When this situation occurs, the

FO should take the following steps:

• Consult the maneuver unit commander, if possible

• Consider previous guidance on target priorities and mission

precedence

• Use his own judgment to determine which of several important

targets should be engaged first

• Use target numbers assigned during the MTO; this will help the

experienced FO with handling multiple missions.

The FO may also record the corrections determined for each target

to eliminate any confusion that may arise in the heat of the battle.

If other FOs are using the same COF net, then each FO should

continue to use his call sign during the mission.

5903. Auxiliary Adjusting Point. To achieve surprise, the FO

may decide not to adjust directly on the target but to adjust on a

nearby point. This nearby point, which is the auxiliary adjusting

point, must be far enough from the target (at least 500 meters) to

obscure the real purpose of the adjustment. (See figure 5-30 on

page 5-82.) Also, the auxiliary adjusting point must be selected so

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that an accurate shift to the target can be determined (preferably

lateral). When the adjustment on the auxiliary adjusting point is

complete, the shift to the target is made.

5904. Disoriented Observer. Poor visibility, unreliable maps,

deceptive terrain, or rapid movement through unfamiliar terrain

sometimes makes it difficult for the FO to orient himself. The FO

may call for marking round(s) to be fired on a known point,

previously fired target, or prominent terrain feature.

Example

"Mark hill 37."

Auxiliary

Adjusting Point Lateral Shift

(Right 500)

Figure 5-30. Auxiliary Adjusting Point.
As a last resort, the FO may call for a round or rounds to be fired

into the center of the target area.

Example Mark center of sector.

The FO usually requests a type of projectile that is easily

identifiable (such as WP), or he can request a higher burst with HE

or WP. The unit may have an SOP for shell/fuze combinations.

The FDC prepares data that will place the round at the point

requested by the FO. If the FO fails to see the round, the FDC

prepares data that will move the next round to a different point of

impact or that will raise the burst higher in the air. This procedure

is continued until the FO positively identifies the round. The FO

then orders a shift from the point of impact (burst) of the identified

round to a target or object that is permanent or semipermanent in

nature, for example, a road junction or the ruins of a building.

Once this point has been located by the adjustment of fire and has

been plotted at the FDC, the observer may use it as a known point

from which shifts can be made to subsequent targets.

5905. Irregular-Shaped Targets. When calling for fire on an

irregular-shaped target, the FO must request the appropriate sheaf

or describe the target in sufficient detail to allow the FDO to

decide how best to attack the target. Choices include circular,

linear, rectangular, and laser-drawn targets. For large targets that

warrant multiple batteries or battalions, the target is segmented so

that individual batteries provide coverage for a portion of the target.

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5-84

a. Circular Sheafs. Circular sheafs may provide the best coverage

of an irregular target area. The circular sheaf is the default sheaf for

automated FDCs (100-meter radius). With a single battery, aim

points are placed half the distance from the center grid and radius

edge. Large targets are segmented for multiple units.

b. Linear and Rectangular Targets. Linear and rectangular

targets require orientation in terms of direction. The FO sends the

grid, size, and attitude of the target. The grid is the location of the

center of the target. The size is the length and width of the target.

The target attitude is described as a clockwise angle, in mils,

measured from grid north to a line passing through the long axis of

the target. (See figure 5-31.) Attitude is sent to the nearest 100 mils

and is always less than 3,200 mils.

Figure 5-31. Target Attitude.
c. Laser-Drawn Targets. The MULE, or oriented BC scope with

laser rangefinder, allows irregular targets to be "drawn," or traced

by the observer. The BCS or Initial Fire Support Automation

System (IFSAS) then determines the best distribution to cover the

target area. The number of lased points does not correspond to

howitzer aim points and therefore does not need to equal the

number of howitzers firing (as with the laser-drawn FPF). With a

single battery, the first and last lased points are the only points that

are also aim points for howitzers. All other howitzer aim points are

equally distributed over the target (nonlinearly). A laser draw

mission can be used to create linear or rectangular targets by

simply lasing two points and announcing the appropriate width.

5906. Emergency Observer Procedures. In an emergency

situation in which an FDC is not available, the FO may determine

and send fire commands directly to the battery. This technique is

applicable only to the experienced FO. Initial data is determined by

use of the following steps.

a. Step One. Estimate the range from the battery to the target.

b. Step Two. Determine the M3A1 green bag charge by use of the

following rule: Charge equals range in thousands (155 mm).

Example (155 mm)

Range 5,000 equals charge 5.

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5-86

c. Step Three. Determine the deflection to the target by converting

the azimuth to the target into deflection. You must know the

battery azimuth of lay.

d. Step Four. Use an elevation of 240 mils (announced as quadrant

240 mils) to fire. A subsequent correction for range may need to be

applied before the first round.

e. Step Five. Make subsequent corrections as required.

(1) Determine 1 00/R, where 1 OOIR equals the number of mils

required to move the burst laterally (deflection) or vertically

(HOB) 100 meters. 100/R equals 100 divided by the range in

thousands to the nearest hundred. (Range 4,600: 100fR 100 —4.6 = 21.7>> 22.)

(2) Determine correction in deflection in relation to the GTL.

Correction in deflection, in mils, equals the change in meters

(divided by 100) times I 00/R (left add, right subtract (LARS)). (A

correction of R120 = 120 ÷ 100 = 1.2 x 22 (100IR) 26.4 >> 26

mils.)

(3) Determine the change to quadrant elevation (QE) that will give

a 100-meter range change (C-factor). (See table 5-9 on page 5-87.)

A change in QE is expressed in mils. Range change is expressed in

hundreds of meters times the C-factor.

(4) Determine the initial fuze setting by estimating TOF during

adjusting rounds.
(5) Adjust the HOB by using a C-factor of two divided by initial

fuze setting for the change in HOB (up subtract, down add).

Example

Estimated TOF (fuze setting) = 16 sec; results in graze burst.

Correction up 40.

2 + 16 = 0.125; 40 (HOB correction) + 10 m (HOB) = 4 corrections;

up = subtraction from previous fuze setting.

0.125 x 4 = 0.5 sec subtracted from 16.0 = 15.5; announced time 15.5."

Table 5-9. Artillery C-Factor.

r

1155 m

Weapon

m (M198, M109)

C-Factor

11 minus charge

(reverse blank)

5-87

Chapter 6

Naval Gunfire Special Situations

This chapter applies to special situations that are unique to NGF.

These NGF procedures are used in conjunction with those

discussed in chapter 4.

6001. Illumination. Battlespace illumination facilitates

observation for both the spotter and the combat unit and restricts

the enemy's freedom of movement. Illumination shells can be used

to illuminate areas of suspected enemy activity, to provide

illumination during adjustment of night fire missions, and to harass

the enemy. There are two methods of employing illumination:

continuous and coordinated.

a. Continuous Illumination. Continuous illumination will

automatically be used during the fire-for-effect phase of

coordinated illumination missions. It may also be used in

surveillance missions. When firing continuous illumination, the

ship will fire one round approximately every 15 seconds; this will

result in one round bursting, one flare at midpoint of descent, and

one flare near burnout. This technique should be used with

discretion to avoid wasting the limited number of star shells

(illumination projectiles) available in the ship's magazine.

b. Coordinated Illumination. Coordinated illumination is the

common technique used by NGF spotters to adjust fire during

6-1
6-2

darkness. The spotter will transmit a call for fire for a suspected

target, the. location of which is not sufficiently accurate to fire for

effect. The ship will fire an illumination round over the initial

target location. The spotter will then move the illumination by

subsequent adjustments. When the flare is adjusted to provide good

target illumination, the spotter will inform the ship of the moment

of best illumination by transmitting the command "stand by,

mark." The ship will then compute gun data to fire the initial round

for HE adjustment to impact directly under the point of

illumination burst at the moment of best illumination. There will

be a single salvo of illumination fire for each adjustment. When

fire for effect begins, the ship will fire adequate continuous

illumination to ensure that the spotter can see the target.

c. Illumination Call for Fire. The spotter uses the standard call

for fire format. The spotter announces either "continuous

illumination" or "coordinated illumination" in the special

instructions subelement of the call for fire. The number of guns is

omitted because one gun is standard. The ammunition

(illumination projectile and flize) is also omitted. The mission may

require reduced charge to prevent ripped chutes, particularly when

firing at ranges of less than 7,000 meters. The following is an

example of a coordinated illumination call for fire.

Exam pie

Spotter: 'AIB this is C2D, fire mission, target numberAF 1011, over."

Spotter: 'Gild 344 677, altitude 55, direction 2680, suspected enemy

activity, coordinated illumination, over."
d. Prefiring Report. To differentiate between the illumination

trajectory and the trajectory to be used for subsequent HE, the ship

announces "line of fire," followed by "ready" and a TOF for the

illumination projectile. The spotter must consider the path of the

empty canister and its probable impact point along the line of fire.

The spotter reads back the prefiring report and commands "fire."

e. Illumination Adjustment Procedures. Spottings are made to

determine the location of the flare at the midpoint of descent and

the height of burnout of the flare. The flare is normally corrected to

position it over (behind) the target along the OTL to achieve a

silhouette of the target. If the target is on a slope, the flare will

normally be positioned short of the target to allow the light to shine

back onto the target. The direction and speed of the wind will also

affect the positioning of the flare.

(1) Deviation and Range Corrections. These corrections are

given in multiples of 100 meters; the minimum correction is 100

meters. Because the illuminated area is large, bold corrections are

normally used instead of bracketing.

(2) Height of Burnout. The height of burnout should be between

zero (as it touches the deck) and 50 meters above the deck.

Corrections are given in multiples of 50 meters, with a minimum

correction of 50 meters. If the flare burns on the deck, the spotter

counts the number of seconds that it burns, multiplies this by the

rate of descent, and rounds up to the nearest 50 meters. For the

five-inch illumination projectile, the rate of descent is 10 meters

per second.

6-3
6-4

Example

A flare bums on the deck for four seconds. The correction is Uup 50.

(4 sec x 10 rn/sec = 40 (round up to 50))

If the flare burnout is in the air, the spotter must determine the

height of burnout. This can be done by using binoculars (mils x OT

factor). A second technique involves counting the number of

seconds that it takes the flickering ember from the flare to reach the

deck and multiplying that number by the rate of descent. After

rounding down to the nearest 50 meters, a correction is given to

cause the height of burnout to be between zero and 50 meters.

Exampie

A flare burns out in the air. The spotter counts seven seconds from the

burnout until the ember touches the deck. The correction is "down 50."

(7 sec x 10 rn/sec = 70 (round down to 50))

f. Continuous Illumination Procedures. The spotter will adjust

the illumination as discussed above. Once the target has been

properly illuminated, the spotter can then begin the fire-for-effect

phase of the mission. In the fire-for-effect phase, the ship will fire

illumination projectiles at a certain rate of fire to keep the target

area continuously illuminated. The spotter may increase or

decrease the rate of fire by ordering an interval or sustained fire.

The following are examples of entering the fire-for-effect phase.
Examples

"10 salvos, fire for effect, over." (The ship determines the rate of fire.)

"Sustained fire, five minutes, fire for effect, over."

"10 salvos, interval 10, fire for effect, over."

When the spotter desires to terminate illumination early during the

fire-for-effect phase, he should transmit "cease illumination." If the

spotter acquires a target during a continuous illumination mission

and desires to change to coordinated illumination, he should

transmit the command "coordinated illumination." This command

is followed by any desired illumination corrections, target

description, method of engagement, and method of control

changes.

Exampie

"Coordinated illumination, left 200, troops in the open, fuze CVT in effect,

over."

The ship will fire one illumination projectile and be prepared to

mark. Coordinated illumination procedures are described below.

g. Coordinated Illumination Procedures. The spotter's request

for coordinated illumination may result from acquiring a target

during a continuous illumination mission or may be a part of the

spotter's method of engagement in the initial call for fire. The

request for coordinated illumination alerts the ship that the spotter

will adjust the illumination and will subsequently request and

adjust HE projectiles timed to impact at the moment of best

illumination. During the illumination adjustment phase of the

6-5
6-6

mission, the ship will time every illumination projectile fired and

will be prepared to mark when commanded by the spotter. The

spotter will adjust the illumination onto the target area by using the

procedures outlined previously.

(1) Establishing the Mark. Once the illumination flare has been

positioned to yield the optimal light on the target, the spotter

transmits "stand by . . . mark, over." "Mark" informs the ship of

the optimal illumination. The ship will then time the firing of each

HE projectile to impact at the optimal time.

(2) Adjusting High Explosive. Immediately after receiving the

readback of "mark out" by the ship, the spotter will initiate the HE

adjustment phase. The spotter transmits any subsequent corrections

to improve the accuracy of the initial HE salvo. If no HE correction

is sent, the ship will fire the initial HE projectile at the point of

flare deployment, which may be positioned off the target location

(for silhouette or wind purposes).

Examples

"HE left 200, drop 200, over."

"HE repeat, over."

(3) Prefiring Report. The ship will transmit a new prefiring report

for the HE projectile. The spotter will read back and command

"fire." The ship will transmit "shot" for the illuniination projectile

and "splash, out" for the HE.
(4) Subsequent Corrections. The spotter must preface each

command with the type of projectile to which the correction is to

be applied.

"llluminatio

Examples

n add 200, HE left 200, over."

"HE add 50, 0 salvos, fire for effect, over."

(5) Modifying the Mark. During the mission, the spotter may

desire to change the timing between the illumination and the HE

projectiles. To modify this interval, the spotter uses the term

"advance" or "retard." The command "advance" shortens the time

of firing between the illumination projectile and the HE projectile

(i.e., the ship will fire the HE round sooner). The command

"retard" lengthens the time of fires between the illumination

projectile and the HE projectile (i.e., the ship will fire the HE

round later).

Examples

"HE left 200, advance five (seconds understood)."

"HE retard five (seconds understood)."

(6) Illumination During the Fire-for-Effect Phase. During the

fire-for-effect phase, the ship will automatically fire limited

continuous illumination to provide adequate illumination for

surveillance. The ship will fire the last illumination projectile

immediately after the last impact round in fire for effect unless the

spotter commands "cease illumination" sooner.

6-7
6-8

h. Illumination Projectile Malfunctions. Two types of

malfunctions are unique to illumination rounds. Ripped chutes and

dark star are special procedures used by ships and spotters to

compensate for these malfunctions.

(1) Ripped Chutes. As a result of high muzzle velocity at shorter

ranges, flare chutes may rip or separate on deployment. Should this

occur, the spotter reports to the ship "ripped chute, repeat" or

"ripped chute, reduced charge, repeat." The procedure used

depends on how often ripped chutes occur and whether or not the

target area can be ranged by using reduced charge. The spotter may

also request that the ship increase the range.

(2) Dark Star. A dark star is an illumination round that fails to

deploy or fails to ignite. Such malfunctions are caused by either

faulty ammunition or improper fuze settings. When a dark star

occurs, "dark star, repeat, over" is reported. The ship should

immediately check its time fuze settings and note the time fuze lot

being used. Additional dark stars may indicate a malfunction in the

time fuze lot.

6002. Smoke. Ships can deliver only limited quantities of WP

smoke, which produces rapid smoke buildup but has effects of

limited duration. Early coordination with the ship will forewarn

them to load the smoke anununition in the gun turrets/mounts.

6003. Fresh Target Shift. At any time during a mission and before

transmitting "end of mission," a spotter may desire to shift fire to a

higher priority target. To do this, the spotter uses the fresh target
shift technique. (See figure 6-1 on page 6-10.) The fresh target

shift technique allows the ship to accomplish the shift to the fresh

target more rapidly than if a call for fire with new target location

data were introduced into the gunfire control computer. The fresh

target shift allows the spotter to temporarily suspend the

adjustment of fire for the original target, bring fire onto a higher

priority target, and then resume fire on the original target, if

desired.

a. Call for Fire for Fresh Target Shift. The spotter sends an

abbreviated call for fire, applying a correction from the impact of

the last salvo to cause the next impact to be on the fresh target. If

initiated before the impact of the initial salvo, corrections are made

from the target location data sent in the call for fire.

(1) Spotter Identification. Omitted.

(2) Warning Order and Target Number. Transmitted as "fresh

target, target number (assign next target number)." There is no

break in transmission.

(3) Target Location. Expressed as a deviation, range, and/or

altitude correction from the last salvo fired. The shift is based on

the original OT direction. The direction to the fresh target is not

transmitted until after the first salvo of the fresh target shift has

been fired and then only if it differs from the original direction by

more than 100 mils or five degrees.

6-9
6-10

(4) Target Description. Must always be included.

(5) Method of Engagement. Omitted unless a change from the

initial call for fire is required. Because the essence of the fresh

target shift is timeliness, changes that may cause a delay, such as

changes in ammunition, should be avoided. The spotter may

consider using a less preferred shell/fuze combination to obtain a

timely response.

(6) Method of Control. Omitted unless a change from the initial

call for fire is desired. If the spotter was in the fire-for-effect phase

Fresh Target

Target Number AB 1018

Left 280

Ad 100

Tank, Over

Figure 6-1. Fresh Target Shift Technique.
on the original target, the fire-for-effect phase will continue unless

the spotter announces, "spotter adjust, over."

b. Adjustment for Fresh Target Shift. Once the initial salvo for

the fresh target impacts, the spotter transmits a new OT direction

(if required) and conducts adjustment onto the fresh target in the

normal manner.

c. Termination of Firing on the Fresh Target. The spotter

continues adjustment until he has achieved the desired effects on

the fresh target. If the spotter desires to resume firing on the

original target, he again uses the fresh target shift technique to

return to the original target. The target is referred to by its original

target number.

(1) Record as Target. If the spotter wants the ship to record the

target for future firing, he must transmit "record as target, target

number _____"after fire for effect on that target is completed.

(2) End of Mission. When the spotter is satisfied with the effects

on each of the targets (both the fresh and original targets), the

mission is terminated in target number sequence. Each target must

be referred to by target number when reporting the damage

assessment.

Example

"End of mission, target number 17 (original target), bunker destroyed, target

number 18 (fresh target), tank neutralized, over."

6-11
6-12

6004. New Target Shift. At any time during a fire mission, the

spotter may wish to attack another target that is not of a higher

priority. If the ship has the capability to conduct multiple missions

(multiple mounts and an MK-86 gunfire control system), the

spotter can send an abbreviated call for fire without interrupting the

original mission. He uses a shift from the last salvo, similar to the

procedure described for fresh target shift. The spotter then

conducts adjustment on both targets. The difference between the

fresh target shift and the new target shift is that for fresh target

shift the spotter conducts adjustment for one target at a time, while

for new target shift he conducts adjustment on two targets

concurrently. The call for fire and adjustment procedures for the

new target shift are the same as those described for fresh target

shift, with the following exceptions:

• Warning order and target number are transmitted as follows:

"new target, target number (next target number)." There is no

break in transmission.

• The spotter must preface each correction with the target number

to which it is to be applied. If confusion will not result, the

spotter may use the last two digits of the target number.

• On completion of fire for effect for the first completed mission,

the spotter may record the target if desired. He completes the

mission by reporting "end of mission."

6005. Simultaneous Engagement of Two Targets. If the ship has

the capability to conduct multiple missions (MK-86 gunfire control

system), the spotter can adjust fire on multiple targets
simultaneously. The procedures for the simultaneous engagement

of two targets differ from those of the new target shift in that the

target location will not be sent by using the shift from the last

salvo. The call for fire for the second target in simultaneous

engagement uses the standard six-element call for fire. The spotter

must preface each correction with a target number. The ship will

not transmit "splash;" this will provide more time for the spotter to

transmit corrections.

6006. Firing on a Recorded Target. If fires are desired on a

previously recorded target or a planned target, the spotter sends an

abbreviated call for fire consisting of the following elements.

a. Spotter Identification. Required.

b. Warning Order/Target Number. Consists of the words "fire

mission, fire target number." There is no break in transmission.

c. Target Location. Omitted because it is already known by the

ship.

d. Target Description. Omitted unless changed from recorded

description.

e. Method of Engagement. As required.

f. Method of Control. As required. When firing a recorded target

from the same ship in the same firing track as when the data was

recorded, a first-salvo fire for effect may be feasible.

6-13
6-14

6007. Destructive Fire. Destructive fire missions involve

deliberate, accurate gunfire and normally employ a single gun

against each target. This can be expensive in ammunition and can

take a considerable amount of time to execute. During the mission,

the gunlammunition lot is not changed. The ship should be

positioned to allow for the best conditions and orientation with

respect to the GTL and the terrain in the target area.

a. Adjustment. Ship adjust should be used if possible. When the

spotter conducts the adjustment, he uses normal adjustment

procedures until the MPI is at the split of the 100-meter range

bracket.

b. Fire for Effect. Groups of rounds, usually five for a single gun,

are fired, and the average deviation and range spottings are noted.

A correction is then sent based on the MPI of all the rounds. Five

rounds are fired again. The correction is made to be as accurate as

possible.

Example

'Right 10, drop 25, repeat, over."

or

"Left five, repeat, over."

6008. Massed Fire. Massed fire is "the fire of the batteries of two

or more ships directed against a single target." (Joint Pub 1-02) On

occasion two or more ships will be required to engage large or

important targets simultaneously. If they have not already been

tasked with a direct support mission, gunfire request procedures
must be initiated. A collective call sign will be used in the request.

All orders from the spotter will be read back by the senior ship.

The other ship(s) will acknowledge the transmissions. The first

ship to report "ready" will be adjusted onto the target in the normal

manner. The other ships will be individually adjusted as they report

"ready." The spotter will address individual ships (e.g., when

conducting adjustment) by using each ship's call sign. Usually one

or two bold corrections are used to bring the MPI into the required

target area. To facilitate spotter control, "at my command" may be

employed. At the completion of adjustment, the spotter will

announce "cancel at my command, all guns (number) salvos, fire

for effect, over."

6009. Special Naval Gunfire Commands and Reports

a. Safety Considerations

(1) Check Firing. Anyone can command "check firing" when an

unsafe situation becomes apparent. This command causes the ship

to instantly stop firing.

(2) Cancel Check Firing. The originator of check firing must

announce "cancel check firing" for the fire mission to continue.

b. From the Spotter

(1) Spreading Fires. This is a report to indicate that fires for effect

are about to be distributed over an area by corrections. The spotter

announces "spreading fires," followed by a correction and the

command "repeat" (pertaining to the volume of fire).

6-15
6-16

Example

"Spreading fires, right 200, repeat, over."

(2) Trend. A trend is the straying of the fall of shot from salvo to

salvo. If the spotter notices a trend, he announces "trend," along

with an indication of direction and distance (in meters). This is a

correction to move the MPI back to the target.

Exam pie

"Trend, southwest 100 per salvo."

(3) Check Solution. Check solution is an order transmitted by the

spotter when he suspects an error in the gunnery solution for a

salvo. Before transmitting "check solution," the spotter should

check his target location data. The ship will respond with either

"solution checks" or "neglect."

c. From the Ship

(1) Neglect. This report is sent by the ship to indicate that the last

salvo was fired with incorrect data. The ship corrects the settings

and transmits "ready, over" when prepared to fire.

(2) Delay. Delay is a report indicating that the ship is not ready to

fire. The report is followed by an estimate of time in minutes,

usually of short duration, that the ship will be unable to fire. When

the ship is prepared to fire, the ship will report "ready, over."
(3) Will Not Fire. This report means that the ship will not continue

the mission for a stated reason, for example, a gun mount

malfunction (mount casualty) or a higher priority mission or

circumstance such as counterbattery fire.

(reverse blank)

6-17

Chapter 7

Aerial Observation

7001. Aerial Observer. An aerial observer is trained to observe

the battlespace from an aircraft to conduct reconnaissance and

adjust artillery and NGF. An aerial observer may also perform the

duties of a FAC(A) or TAC(A). Aerial observers adjusting NGF

are also referred to as air spotters. Marine aerial observers operate

primarily from the F/A-i 8D fixed-wing aircraft and the AH- 1W or

UH-1N helicopter. The aerial observer uses procedures and

terminology for adjusting fires similar to those employed by the

ground observer or spotter. Some variations are imposed by his

perspective from the aircraft. This chapter will discuss the unique

aerial observer procedures for calling for and adjusting artillery

and NGF.

7002. Prelaunch Considerations. The aerial observer and pilot

are given a thorough briefing of the current tactical situation,

including the friendly and enemy orders of battle. The briefing

addresses the current friendly situation, including infantry

objectives, locations, front lines, zones of action, patrol plans, and

coordinating measures. Additionally, the following information

should be obtained during mission preparation:

• Enemy locations, organization, and equipment

7-1
7-2

• Battery positions, known points, targets, reference lines

available for making corrections, suspected target areas, areas to

be searched, and ordnance available

• Maps and photographs, obstacles, and checkpoints

• Communications details (frequencies, call signs, prearranged

signals, and authentication sheets)

• Established operational procedures or SOPs, such as the method

of fire for immediate suppression, special munitions, and SEAD

• FSAs, FSSs, NGF ship disposition and availability, and radar

beacon positions

• Specific mission preparation (includes time of takeoff and

return, routes, mission, check-in times, control measures, known

fires and airstrikes, restrictive fire plans, weather, and relief on

station)

• Message drop and pickup stations

• Panel code

• Location of ground radios

• Pulse repetition frequency (PRF) code words.

7003. Reporting In and Out. The pilot reports in and out to air

control agencies when airborne or over an assigned orbit point by
using the UHF radio. The aerial observer reports in and out with

ground agencies by using the UHF/VHF radio.

a. Communication Nets. In addition to the division artillery air

spot net or the NGF air spot net (see chapter 1), the following nets

may be used.

(1) Ship Air Spot Reporting In and Out Net (Ultrahigh

Frequency). When arriving on station, the aerial observer must

check in with the SACC or the appropriate FFCC/FSCC. For NGF,

the ship air spot reporting in and out net is employed for the

following:

• To assign air spotters to specific gunfire support ships and

SFCPs as directed

• To direct NGF air spotters to guard other air spot frequencies, if

required

• To brief spotters, as directed, on the location of targets, friendly

front lines, zones of action, and so on

• To release air spot planes when relieved and return them to the

tactical air traffic control (TATC) net controller or senior air

observer for departure from the area. The stations on this net

include parent carriers, land base(s), tactical air commanders,

the commander of the landing force, and all airborne NGF

spotting aircraft that report in and out.

7-3
7-4

(2) MAGTF Air Observation Net (Ultrahigh Frequency/Very

High Frequency). This net provides a means for controlling air

observation and for the transmission of information from landing

force aerial observers to landing force headquarters and other

landing force units. It may also be used for adjustment of artillery

or NGF on an emergency basis. Multiple air observation nets may

be required, depending on the scope of the operation. The stations

on this net include the SACC, the FFCC, the FSCC(s), and the

senior artillery FDC.

(3) MAGTF Artillery Air Spot Net (Very High Frequency!

Ultrahigh Frequency). This net provides the landing force

headquarters, FFCC or senior FSCC, artillery regiment, artillery

battalions, and liaison officers with an air spot net for conducting

fire on deep and difficult targets. Stations on this net include

landing force aerial observers, the force command element, GCE

artillery aerial observers, and landing force artillery units, as

required.

(4) Division Air Observation Net (Very High

Frequency/Ultrahigh Frequency). This net provides a means for

controlling air observation and for the transmission of information

from division aerial observers to division headquarters and other

division units. It may also be used for adjustment of artillery or

NGF on an emergency basis. Stations on this net include the

division headquarters, aerial observers, and subordinate division

units, as required.
(5) Tactical Air Traffic Control Net (Ultrahigh

Frequency/Very High Frequency). This net provides a means for

the TACC/tactical air direction center (TADC), tactical air

operations center (TAOC), and DASC to exercise airspace control

of all tactical aircraft and itinerant aircraft in the objective area.

The stations on this net include the TACC/TADC, the TAOC(s),

the DASC, fixed-wing aircraft, and helicopters.

(6) Tactical Air Request/Helicopter Request Net (High

Frequency/Very High Frequency). This net provides a means for

the request of immediate air support from the DASC. The stations

on this net include the DASC, TACP(s), FFCC/FSCC(s), the HDC,

the FAC(A), the TAC(A), and the ASC(A), as required. In

amphibious operations, a dedicated net (i.e., helicopter request

(HF/VHF)) may be activated during ship-to-shore movement for

immediate helicopter requests.

(7) Tactical Air Direction Net (Ultrahigh Frequency/Very High

Frequency). This net provides a means to direct aircraft in the

conduct of CAS missions and for the DASC to brief support

aircraft on target information or for the DASC to assign to aircraft.

There are multiple tactical air direction (TAD) nets available for

assignment by the DASC to terminal control agencies (e.g.,

TACPs, FAC(A)s). The TAD net is not a planning net, but is a

terminal control net on which extraneous traffic is to be avoided.

b. Communications Means. Table 7-1 on page 7-6 displays the

radios that are available for communications by aerial observers.

7-5
7-6

Table 7-1. Communications Means Available to the Aerial

Observer.

Aircraft - Communications Means

F/A-18D Two ARC-182 transmitters/receivers with the capability to monitor

any two frequencies in UHFNHF/amplitude modulation (AM)/FM.

The ARC-182 transmitters/receivers are capable of operating when

covered.

AH-1W Two ARC-182 transmitters/receivers with the capability to monitor

any two frequencies in UHFNHF/AM/FM. The ARC-182

transmitters/receivers are capable of operating when covered.

UH-1N UHF and VHF (with the ASC-26 communications package

installed—one additional UHF and two additional VHF radios with a

retransmission capability). May also have HF capability.

7004. Call for Fire. The call for fire (artillery and NGF) used by

the aerial observer is the same as that discussed in chapter 3. The

following are special considerations for the aerial observer who is

making a call for fire.

a. Marking the Target. The aerial observer may mark the target

for a firing ship and use the ship adjust method of control. This

technique should be used only in a low-threat environment.

b. Method of Control. The command "at my command" allows

the pilot the time to position the aircraft for observation.

c. Target Location. Target location is determined by either the

grid or shift from known point method. The methods are the same

as discussed in chapter 2, with the following considerations or
modifications. Obtaining accurate target location is difficult

because targets are normally acquired by the naked eye. The use of

gyrostabilized, low-light-capable binoculars facilitates accurate

target location and adjustment of fire and increases aircraft

survivability. (The Fujinon Stabiscope S-40 is used and available

through open purchase.) Nongyrostabilized binoculars are difficult

to use because of distortion caused by the windscreen and vibration

of the aircraft. Hand measurements or estimations can be used to

measure angular deviation. The aerial observer should seek an

object to use as a yardstick for assistance in estimation.

Exampie

A bridge span that is measured on the map to be 200 meters can be used as

a yardstick in target location and adjustment of fire.

The aerial observer's capability to determine an accurate target

location may be limited by the enemy situation. Because of the

enemy acquisition capability, the aerial observer may be afforded

only a short exposure time. The aerial observer can offset the

enemy's acquisition capability by using the forward looking

infrared (FUR) receiver. (See chapter 9.)

d. Direction. The aerial observer selects one of the types of

direction based on the battlespace environment, terrain, type of

aircraft, and his experience and training.

(1) Gun-Target Line. The GTL provides an effective type of

direction for the adjustment of fire. In artillery, if the aerial

observer has knowledge of the firing unit's location, he can readily

7-7
7-8

use the GTL for adjustment. The FDC will assume that the GTL is

being used unless otherwise specified by the observer. In NGF, if

the aerial observer can see both the ship and the target or can

clearly visualize the GTL on the ground, this type of direction can

be used. The aerial observer must specif' "direction GTL" if he

desires to use this type of direction.

(2) Arbitrary Reference Line. The aerial observer can use visible

terrain or a manmade feature as a reference line. The aerial

observer uses this line or a corresponding parallel line and projects

it through the target. The aerial observer must be able to see both

the target and the reference line feature simultaneously from all

angles of approach. Roads, rivers, power lines, and railroads are

examples of good reference lines.

(3) Observer-Target Line. OT direction is excellent for an aerial

observer who is observing from a helicopter. The bearing-distance

heading indicator (BDHI) on the aircraft instrument panel can be

used to determine OT direction in degrees magnetic. The aerial

observer may have to transmit a new OT direction for subsequent

adjustments. Aerial observers have a difficult time using the OT

direction while performing the observation from a fixed-wing

aircraft. The aircraft will not normally head directly for the target

on every pass. Therefore, the aerial observer may have to estimate

OT direction from the sides of the aircraft. The clock method using

the nose of the aircraft can facilitate this estimation.

(4) Cardinal Direction. Cardinal direction, although less accurate,

can be used for direction.
e. Summit or Maximum Ordinate. The aerial observer may

desire to know the summit or maximum ordinate for use in aircraft

positioning and flight-path selection. In artillery, the aerial

observer may request the maximum ordinate from the firing unit.

In NGF, the summit is automatically reported in the prefiring

report. (See chapter 3.)

f. Time of Flight. The aerial observer is automatically sent TOF in

the artillery MTO or NGF prefiring report. This allows the pilot

time to position the aircraft for observation.

7005. Adjustment of Fire

a. Spottings

(1) Deviation and Range. The aerial observer determines

spottings by map spot, estimation, or hand measurement depending

on the aircraft positioning, the threat, and the type of aircraft.

(2) Height of Burst. The aerial observer cannot readily determine

HOB. Consequently, adjustments to HOB for HE with fuze time

are difficult. The aerial observer must rely on the fragmentation

pattern on the ground as a means for determining spots. The use of

VT or CVT eliminates this problem.

b. Corrections. Because of the aerial observer's elevated view, the

one-round adjustment method is preferred. However, other

methods discussed for the ground observer may be used. (See

chapter 3.)

7-9
7-10

c. Adjustment Techniques From a Helicopter. When the aerial

observer is adjusting from a helicopter, he may use either the

stationary hover or pop-up technique for adjustment.

(1) Stationary Hover Technique. In a stationary hover, the pilot

positions the aircraft behind trees or other terrain features that

conceal the aircraft and still permit observation of the target.

(2) Pop-Up Technique. In the pop-up technique, the pilot will

unmask the aircraft two to three seconds before impact of the

round. After the aerial observer observes the burst, the aircraft

returns to the hide position or moves to another hide position. The

aerial observer sends his corrections as the pilot remasks the

aircraft.

7006. Forward Looking Infrared Receiver. The FUR receiver is

a passive device used to detect targets by their infrared radiation.

The FUR receiver views the terrain in the vicinity of the aircraft.

Infrared energy is converted into electrical signals and displayed

on a terminal in the cockpits of F/A-18, F-14, AV-8B (night attack

version), AH-1W, AH-64A, AC-130, F-15E, F-16, and OH-58D

aircraft. The device allows for the recognition, identification, and

classification of targets that would otherwise go undetected as a

result of darkness or camouflage. The FUR receiver provides the

aircrew with an excellent target day or night, although it is usually

better at night. The FUR receiver in conjunction with the laser

makes night adjustment of artillery, mortars, or NGF possible

without illumination and the inherent time delays associated with
illumination missions. The call for fire using the FUR receiver is

the same as discussed previously. (See chapter 3.)

7007. Laser Designators. The F/A-18, F-14, (laser target

designator, low-altitude navigation and targeting infrared for night

(LANTIRN)-equipped) AC-130, AH-1W, and AH-64 aircraft are

currently the only aircraft that have laser designators that are

capable of designating for other acquisition systems or for

laser-guided munitions.

(reverse blank)

7-11

Chapter 8

Suppression of Enemy Air Defenses

SEAD is that activity that neutralizes, destroys, or temporarily

degrades enemy air defenses in a specific area by physical attack

and/or electronic warfare. SEAD should be considered when

friendly aircraft or unmanned aerial vehicles (UAVs) cannot

complete their missions without critically exposing themselves to

enemy air defenses. Although typically associated with offensive

air support (OAS) missions, SEAD may be employed to protect

any type of aircraft or UAV mission, including air reconnaissance,

assault support, antiair warfare, and electronic warfare. When

determined to be appropriate, SEAD fires are delivered during the

critically vulnerable portions of friendly flight profiles. Although SEAD can be provided by various destructive and disruptive

means from either ground or aviation forces, this chapter focuses

on the delivery and coordination of artillery and NGF SEAD fire

missions.

8001. SEAD Coordination. Because aircrews may rely largely on

closely delivered SEAD fires for protection, all details of SEAD

missions must be closely coordinated between aircrews, terminal

controllers, spotters/observers, and fire support coordinators. In

coordinating timing for SEAD missions, everything is based on the

timing of the air mission. Supporting indirect fires will be

scheduled based on a spec/Ic aircraft event time, for example,

CAS TOT/T77', assault support L-hour, UA V mission area arrival

8-1
8-2

time, and so on. Coordination should ensure that aircraft are

protected not only from enemy fires, but also from friendly SEAD

fires. Protection from friendly fires is achieved by separating

aircraft from SEAD fires by time andlor distance. Time and

distance separation techniques are discussed in detail in paragraph

8005. Munition marking rounds may be incorporated into SEAD

fires to aid target identification by OAS aircraft. Target marking is

discussed in paragraph 8007. Depending on the type of air mission

supported, SEAD fire missions are either planned or immediate.

8002. Planned SEAD Missions. Planned SEAD missions are

scheduled during fire planning to support preplanned or on-call air

missions. Units requesting these types of air missions must

consider the air defense threat and submit requests for SEAD

support as appropriate. Typically, known air defense artillery

(ADA) targets will be attacked immediately; however, support for

suppressing undetected systems must be planned. Planned SEAD

missions are the result of coordinated planning by the air support

request, or appropriate FSCCs, and the unit providing aviation or

UAV support. See MCWP 3-16 for more information on the fire

support planning process.

8003. Immediate SEAD Missions. Immediate SEAD missions are

conducted to support immediate air missions. Because of the

urgency of immediate air requests, planning and coordination for

immediate SEAD missions are abbreviated. Critical SEAD

decisions are made primarily by the requesting unit with

supervision by the battalion FSCC. Requests for immediate

artillery, mortar, or NGF SEAD fires are made as calls for fire.
8004. SEAD Decisionmaking

a. Validate Requirement for SEAD. SEAD fire missions do not

guarantee safety from enemy air defenses. These fire missions

divert indirect-fire weapons from other fire support tasks and may

expose those weapons to enemy counterfire. Therefore, terminal

controllers should first attempt to route aircraft away from enemy

air defenses rather than automatically request SEAD fires. If

aircraft cannot be routed away from enemy air defenses, then fire

support personnel must balance aircraft vulnerability against the

risk of exposing indirect-fire weapons to determine whether SEAD

fires are appropriate for that air mission. The temporary diversion

of fire support and the consumption of fire support resources must

also be considered. Before requesting OAS that would require

SEAD support, fire support personnel must first consider whether

artillery or NGF could range the mission target and achieve the

desired effects. If so, an artillery or NGF attack would be more

efficient than an OAS attack supported by SEAD. If the mission

target cannot be ranged by indirect fire or is most efficiently

attacked by aircraft, OAS supported by SEAD fires may be

appropriate.

b. Select SEAD Targets. Targets should be selected based on

aircraft flight tactics/routing and enemy air defense capabilities.

The prerequisite to selection is target location. Often, enemy ADA

is not detected until aviation enters the area; therefore, observers

must be able to acquire ADA based on its battlespace signature.

Suppressive fires are placed as accurately as possible on enemy air

defense sites that can engage aircraft.

8-3
8-4

c. Select Appropriate Weapons System and Firing Unit. Select

an available weapons system and a firing unit that is capable of

firing the appropriate ordnance when an, where required.

Requirements include accuracy, range, ordnance availability, and

state of training. The selection of a particular weapons system

and/or firing unit should not adversely affect other fire support

requirements. Although several indirect-fire systems are capable of

delivering SEAD fires and target marks, artillery is generally most

appropriate because of its range, responsiveness, ordnance, and fire

direction capabilities.

d. Determine Marking Requirements. Specific aircraft missions

such as CAS may require a mark to orient the aircrew onto the

target. Refer to paragraph 8007. for descriptions of various

marking options.

e. Select Appropriate Ordnance. Select the ordnance that will

most effectively suppress the SEAD target(s) without endangering

the aircrew or hindering future maneuver. When firing a munition

marking round, select the ordnance that will best identify the target

to the aircrew. Refer to table 8-1 on page 8-5 and paragraphs 8008.

and 8009. for more information on the vulnerability of enemy air

defense systems and suitability of specific ordnance.

f. Determine Method of Separating Aircraft and SEAD Fires.

To prevent fratricide, aircraft must be separated from SEAD fires

and trajectories. Separation may be by distance (lateral, altitude, or

a combination of altitude and lateral) or by time (interrupted,

nonstandard, or continuous). Distance separation permits the
Weapon Vulnerabilities

ZPU-3IZU-23 Exposed personnel

ZSU 57-21S-60 Optics

ZSU 23-4 2S6 Thin armor plating, optics, exposed radar and antennas

SA-7/14, SA-16 Exposed gunners

SA-9/13 Exposed missiles, optics

SA-6, SA-8 Thin armor plating, exposed radar and antennas,

exposed missiles, susceptibility of radar to jamming

g. Determine Duration and Volume of Fires. Determine the

duration and volume of fires required to protect friendly aircraft

during vulnerable periods of flight. Consider the vulnerability,

resiliency, range, and method of acquisition of the targeted enemy

air defense weapon(s); number and type of friendly aircraft; aircraft

flight tactics and the separation required between aircraft and

SEAD fires; type of ordnance used for suppression; and

vulnerability of the SEAD firing unit. If aircraft must fly near

SEAL) trajectories or effects, SEAD fires must be separated to

prevent fratricide.

8-5

continuous engagement of enemy air defenses during aircraft

vulnerability and thus requires less coordination. If an aircraft must

fly near the effects or trajectories of SEAD fires, SEAD fires may

have to be interrupted to ensure aircraft safety. This interruption of

fires is time separation. Refer to paragraph 8005. for a discussion

of separation techniques.

Table 8-1. Vulnerabilities of Selected Air Defense Weapons.
8-6

h. Timing the Delivery of Fires. Use of a synchronized clock to

coordinate timing, for example, "CAS TOT 1305," is the desired

means of timing fires. As an alternate method, elapsed time can be

used, for example, "CAS TTT six plus zero, zero . stand by,

hack." In selecting/a synchronized or elapsed time to coordinate

ground and air activities, terminal controllers and observers must

allow sufficient time for all units to prepare for the mission and for

FSCC coordination. Observers should send calls for fire as early as

possible during aircraft routing, for example, before the aircraft

departs the IP, to ensure that firing units can deliver SEAD fires on

time.

i. Prepare Call for Fire and Coordinate. When all SEAD

decisions have been made, prepare and transmit the appropriate

call for fire and ensure that all required coordination is completed.

See paragraphs 8008. and 8009. for artillery and NGF SEAD call

for fire procedures.

8005. Separation Techniques. Aircraft and SEAD fires may be

separated by distance (lateral, altitude, or a combination of altitude

and lateral) or by time. Separation by distance is preferred because

it permits the continuous attack of SEAD targets. If distance

separation is too restrictive on aircraft routing, time separation may

be used to protect aircraft from friendly fires. Time separation is

the least flexible and often precludes suppressive fires at critical

moments. Select the separation technique that requires the least

coordination while still providing adequate flexibility and

protection to aircraft.
a. Distance Separation

(1) Lateral Separation. Lateral separation is effective for

coordinating SEAD fires against targets that are safely separated

from flight routes. This technique is effective when aircraft can be

routed away from SEAD trajectories and targets. (See figure 8-1.)

For low-level CAS attacks, lateral separation should be used when

aircraft and firing units engage safely separated targets and when

aircraft will not cross GTLs. (See figure 8-2 on page 8-8.)

8-7

Stay out of quadrant

northeast of grid 62.

Figure 8-1. Artillery-Assault Support Aircraft Lateral

Separation.
8-8

Figure 8-2. Artillery-Close Air SupportAircraft Lateral

Separation.

The minimum separation distance between SEAD targets and

aircraft routes varies based on SEAD ordnance and its

fragmentation pattern. Terminal controllers or the FSCC must

know the GTL so that they can restrict aircraft from crossing

trajectories. Establishing a temporary informal ACA is one method

of maintaining lateral separation, for example, "stay out of

quadrant northeast of grid 6215" or "stay west of river."

3,000 ft MSL

"Stay west of river.'

Legend:

MSL = mean sea level
(2) Altitude Separation. Altitude separation is effective when

aircraft can safely remain above or below indirect-fire trajectories.

Establishing a temporary informal ACA is one method of

maintaining altitude separation, for example, "stay above 3,000

feet mean sea level." (See figure 8-3.) This technique can be used

to support high-level CAS attacks. Altitude separation can also be

limited to a specific area to give aircraft more freedom to

maneuver, for example, "stay below 500 feet mean sea level in

quadrant northeast of grid 6215." (See figure 8-4 on page 8-10.)

MCWP 3-16 discusses computation of altitudes.

8-9

Stay above 3.000 ft MSL.

Figure 8-3. Artillery-Unmanned Aerial Vehicle Altitude

Separation.
8-10

(3) Altitude and Lateral Separation. Altitude and lateral

separation is the most restrictive technique for aircraft routing but

may be required when aircraft must cross the firing unit's GTL.

This technique requires aircraft to remain above or below

indirect-fire trajectories at certain points. For low-level CAS

attacks, this technique is effective when aircraft and firing units

engage safely separated targets but the CAS target requires

Stay above 3,000 ft MSL in

quadrant northeast of grid 73.'

3,000 ft MSL

Figure 8-4. Artillery-Close Air Support Aircraft Altitude

Separation.
crossing the GTL. (See figure 8-5.) This technique is also effective

in protecting helicopters if they can be routed to fly under SEAD

indirect-fire trajectories and away from SEAD targets. (See figure

8-6 on page 8-12.) Separation may be increased by firing

high-angle or reduced charge. Establishing a temporary informal

ACA is one method of maintaining altitude and lateral separation,

for example, "stay below 1,000 feet mean sea level and between

north-south grid lines 58 and 62."

8-11

"Stay below 1000 feet MSL

and between north-south

gnd lines 58 and 68."

Figure 8-5. Artillery-Close Air Support Aircraft Altitude and

Lateral Separation.
8-12

When CAS and indirect fires engage the same target, a stay-above

altitude incorporating the fragmentation effects can be determined.

(See MCWP 3-16.) A lateral offset in the form of a final attack

heading or cone prevents premature crossing of the GTL.

b. Time Separation. Time separation may be required when

aircraft cannot be routed away from indirect-fire trajectories or

SEAD targets. This technique requires the timing of SEAD fires to be

coordinated 'with the routing of aircraft so that even though aircraft

and SEAD fires may occupy the same space, they do not do so at

"Stay below 1000 ft MSL and

between north.south gridlines

58 and 62.

Figure 8-IS. Artillery-Assault Support Aircraft Altitude and

Lateral Separation.
the same time. (See figure 8-7 on pages 8-14 and -15.) For lowlevel CAS attacks, time separation can be used when aircraft are

attacking targets just short of indirect fires along the GTL. (See

figure 8-8 on pages 8-15 and 8-16.) All timing for SEA]) fires is

based on a specific aircraft event time, for example, CAS TOT!

TTT, assault support L-hour, UAV mission area arrival time, and so

on. In immediate SEAD fire missions, the aircraft event time

becomes the zero hour or H-hour for scheduling. The preferred

method for coordinating timing is the use of a previously

established synchronized clock. If a synchronized clock has not

been established or is not universally available, an elapsed time may be

used to coordinate timing. See appendix D for instructions on

establisbing and communicating synchronized and elapsed times.

(1) Interrupted SEAD. The interrupted SEAD program separates

aircraft and SEA]) fires by halting indirect fires before the aircraft

event. Interrupted SEAD fires are delivered during the first critical

portion of the aircraft's approach phase, specifically from 1 minute

before the CAS TOT/TTT until 30 seconds before the CAS

TOT/TTT. This program is requested by stating "interrupted" as a

method of fire and control.

(2) Continuous SEAD. The continuous SEAD program is used

when providing suppressive fires throughout the aircraft event.

Continuous SEA]) fires are delivered during the critical portions of

the aircraft's approach and egress, specifically from one minute

before the CAS TOT/TTT until one minute after the CAS

TOT/TTT. This program is requested by stating "continuous" in the

method of fire and control.

8-13
8-14

Figure 8-7. Artillery-Tactical Recovery of Aircraft and

Personnel (TRAP) Aircraft Timed Separation.

1..flow 1410, SEAD nneus Mo

Mgh ryneus one and tdu3 Mo

thicugir Øus three.

Unprotected

Flight

- V i

14O8.i

Protected

Flight

1.-hour 1410, SEW unnus Mo

through rrrynus one and plus two

thmugir plus

Protected Flight

1410.05
Figure 8-7. Artillery-Tactical Recovery of Aircraft and

Personnel Aircraft Timed Separation (continued).

Figure 8-8. Artillery-Close Air Support Aircraft Timed

Separation.

8-15

1.-4oe 1410. 00ADnl1..o

Itwoogli ninin on. ond plot t

th.oogh plot tlr.. Protected Flight

Unprotected

Flight

*

1411.03

Protected Right

-ToT 1410, SEAD n,ot. lot 0ntoØ lIlo 01 •od Plot toto —

Unprotected

Flight

-7.

Protected Flight

fl408.57
8-16

Figure 8-8. Artillery-Close Air Support Aircraft Timed

Separation (continued).

TOT 1410, SEAD rronus two

through rrsnus one and pius one

through pkis twO.

/

Protected Flight

1410.00

TOT 1410, SEAD rnmus two

through minus one end ptu3 one

through phth twO.•

Protected

Flight

Unprotected

Flight

Protected

Flight

1411.03
(3) Nonstandard SEAD. The nonstandard SEAD program is used

when suppressive fires other than interrupted or continuous are

desired (specifically, for fires that begin sooner, last longer, or are

intermittent). In addition to requesting "nonstandard," desired

times are specified in the method of fire and control.

Example

"Nonstandard, from minus two to plus six, additional mark at plus two."

c. Separation Techniques. Table 8-2 summarizes appropriate

separation techniques for typical CAS scenarios.

Table 8-2. Separation Techniques.

CAS Target

Same as/Near

SEAD Target

CAS Target

Distant From

SEAD Target

CAS

Crosses GTL

High-Level Attack

Altitude separation Altitude separation Altitude or time

separation

Low-Level

Attack

Time separation Lateral separation Altitude and

lateral separation

8006. Airspace Control Measures

a. Fixed-Wing and Rotary-Wing Close Air Support. Terminal

controllers, spotters, and observers must be familiar with the use of

contact points, IPs, holding areas, and battle positions when

coordinating SEAD fires or target marking for fixed- or

rotary-wing CAS aircraft. See paragraph 4003. and MCWP 3-25/

8-17
8-18

Fleet Marine Force Manual (FMFM) 5-60, Control ofAircraft and

Missiles, for more information on these airspace control measures.

b. Other Missions. Aircraft and UAVs conducting deep air

support, air reconnaissance, assault support, offensive antiair

warfare, and electronic warfare missions also use contact points

and IPs. IPs are used by air reconnaissance and assault support

aircraft to start a run on a reconnaissance target or landing zone. En

route points and orbit points are also used by these aircraft.

Aircrews use en route points to define routes of flight to and from

specific areas. En route points allow specific routing of aircraft for

command and control, airspace limitation, and rules of engagement

(ROE) requirements. Orbit points represent geographic or

electronic positions and are used to station aircraft while they await

further routing instructions.

8007. Target Marking for Close Air Support Aircraft. A mark

should be provided for CAS aircraft whenever possible. When one

of the following marking methods is not possible, the CAS target

may be identified by narrative description.

a. Laser Marking. If the CAS aircraft has a laser spot tracker, the

preferred method of marking a target is by laser. The laser ensures

the accurate engagement of the target by LGW but also assists the

CAS aircrew in more accurately delivering unguided ordnance.

Laser marks require coordinating the approach of the aircraft to

correspond with the direction of the reflected laser energy.

b. Infrared Marking. Infrared pointers and other infrared devices

that are now becoming available can be used by terminal
controllers to mark targets at night for pilots who are wearing night

vision devices. Unlike laser designators, these infrared devices

cannot be used to guide or improve the accuracy of aircraft

ordnance. Use infrared pointers with caution as they may expose

the terminal controller to an enemy with night vision capability.

Infrared marks should be initiated 20 to 30 seconds before the CAS

TOT/TTT or when requested by the pilot and continue until the

pilot transmits "terminate" or the weapon hits the target.

c. Marking by Indirect Fire. Artillery, NGF, and mortar

munitions (specifically WP or illumination fuzed to impact on the

deck) are excellent means of visually marking targets for CAS

aircraft. Munition marking rounds should be delivered as close to

the CAS target as possible, with WP marks timed to impact 20 to

30 seconds before the CAS TOT/TTT and illumination marks

timed to impact 45 seconds before the CAS TOT/TTT. This lead

time ensures that the munition marking round is in position early

enough and remains visible long enough for the terminal controller

to provide final control instructions and for the pilot of the lead

aircraft to acquire the target. On the basis of the CAS aircraft's

TOT/TTT given in the SEAD call for fire, the firing unit will

determine the time to fire to ensure that the marking round impacts

as required. Munition marking rounds delivered within 300 meters

of the CAS target are generally considered to be effective enough

to direct CAS aircraft. In case the munition marking round is not

timely or is inaccurate, terminal controllers should be prepared to

use a backup marking technique or rely completely on verbal

instructions to identify the target to CAS pilots. If the situation

requires precise marks, observers or spotters can adjust marking

8-19
8-20

rounds early to ensure that accurate marks, as well as SEAD fires,

are delivered to meet the CAS schedule. This may, however, alert

the enemy to an imminent attack.

d. Marking by Direct Fire. Direct-fire weapons, such as the

MK-19, can be used to deliver a mark. While this method may

provide more responsiveness than indirect-fire marks, its use may

be limited by range and the visibility of the burst in the battlespace.

The M1A1 tank has no WP round and cannot be used for marking.

e. Marking by Another Aircraft. Another aircraft, such as an

F/A-i 8D or AH-lW, can be used to deliver a marking round.

f. Backup Marks. When firing marks, backup marks should be

planned. For example, artillery may be tasked to deliver the

primary mark while a mortar or another aircraft may be assigned

the backup mark responsibility. One consideration for planning

backup marks is the difference between the TOFs of the primary

and backup weapons systems. If a mortar is tasked as backup for

an artillery mark, it cannot have a longer TOF than the artillery.

g. Other Means. Other means may be used to identify a target.

The requesting unit may give a narrative description of the target in

relation to their own position, marked by devices such as strobe

lights, mirrors, or air panels, or in relation to prominent landmarks.

8008. Artillery SEAD. For artillery SEAD support of air missions,

the terminal controller (e.g., FAC) coordinates aircraft routing,

required suppression and marking, and timing with the artillery

FO. The FO, in turn, determines the artillery firing requirements to
protect aircraft from both enemy air defenses and friendly fires and

passes this information to the artillery FDC in the form of a call for

fire. The FSCC monitors these radio transmissions and ensures that

the timing and effects of these SEAD fires are coordinated with

other operations of the unit.

a. Call for Fire. The artillery SEAD call for fire is based on the

standard artillery call for fire format. (See figures 8-9 through 8-12

on pages 8-22 through 8-26.) Calls for fire may include

instructions for marking rounds if required.

(1) Warning Order. SEAD fire requests are identified in the

warning order, for example, "SEAD," "SEAD polar," "SEAD laser

polar," and "SEAD shift known point." The observer identification

and the warning order constitute the first transmission of the call

for fire.

(2) Target Location. Use the most accurate method of target

location for the situation. The target location element of the call for

fire must include the suppression target location(s) and, if required,

the location for a munition marking round. Target locations are

specified by stating "grid to suppress" followed by the location and

"grid to mark" followed by the location. If no mark or suppression

is desired, the requisite portions are omitted. The target location

constitutes the second transmission of the call for fire.

8-21
8-22

Grid Example

"(3rid to suppress 456 123, grid to mark 462 129, over."

Shift Example

"Suppression direction 6300, right 180, add 600, up 45, over."

Polar Example

"Suppression direction 6300, distance 2400, up 40, mark direction 6340,

distance 2500, up 45, over."

Laser Polar Example

"Suppresson direction 6300, distance 2413, vertical angle plus 05, over."

Immediate SEAD Decisions

Mission: UAV high-level flight target damage assessment and

reconnaissance

Targets: One suspected ZSU 23-4; location by shift method

Systemlunit: Artillery/battery one (W6T)

Mark: None

Ordnance: DPICM

Separation

method: Altitude

Duration/volume: From one minute before until one minute after mission

area arrival time

Timing: TOT on synchronized clock

Immediate SEAD Call for Fire

FO: "W6T this is D2R, SEAD, shift known point one, over."

FDC: (Reads back.)

FO: "Suppression direction 3500, right 180, up 40, over."

FDC: (Reads back.)

FO: "Suspected ZSU 23-4, DPICM, minus one through plus five, UAV arrival

time 1430, over."

FDC: (Reads back.)

FDC: "D2T this is W6T, platoon, 13 rounds, VT, TOF 45, over."

FO: (Reads back.)

Figure 8-9. Example of SEAD Call for Fire Using Altitude

Separation and Synchronized Clock.
S — — —

S

a — —

—

-2

I I I I I I I I IJAV in MissionArea—..

Mission Area

Atyval Time 4 Suppression

Figure 8-9. Example of SEAD Call for Fire Using Altitude

Separation and Synchronized Clock (continued).

(3) Target Description. Target description is provided as in the

standard call for fire. Enemy air defense positions should be

identified as known or suspected to assist in developing enemy

intelligence information. Target description is only given for

suppression missions.

8-23
8-24

Immediate SEAD Decisions

Mission: CH-46 assault support insert away from GTL

Targets: One suspected ZPLJ-4 800 meters from landing zone; location by

polar method

System/unit: Artillery/battery one (W6T)

Mark: None

Ordnance: HE/VT and WP/PD

Separation

method: Lateral

Duration/volume: From two minutes before until two minutes after L-hour

Timing: L-hour on synchronized clock

Immediate SEAD Call for Fire

FO: W6T this is D2R, SEAD, polar, over."

FDC: (Reads back.)

FO: "Suppression direction 5640, distance 3600, up 40, over."

FDC: (Reads back.)

FO: "Suspected ZPU-4, VT and WP, minus two through plus two, L-hour 1510, over."

(Reads back.)

FDC: "D2T this is W6T, nine rounds, VT and WP, TOF 37, over."

FDC: (Reads back.)

FO:

ji*

•t 3 2 1 1510 •1 2 .3

+L44øvr S,ppresson

Figure 8-10. Example of SEAD Call for Fire Using Lateral

Separation and Synchronized Clock.
8-25

Immediate SEAD Decisions

Mission: F/A-18 CAS low-level attack

Targets: Suspected .AAA site near CAS target; location by laser polar

System/unit: method

Mark: Artillery/battery one (W6T)

Ordnance: Artillery

Separation method: SEAD HENT; Mark WP/PD (SOP)

Duration/volume: Timing

From one minute before until 30 seconds before CAS TOT

Timing: (standard interrupted SEAD program)

Elapsed time (TTT)

Immediate SEAD Call for Fire

FO: "W6T this is D2R, SEAD, laser polar, over."

FOC: (Reads back.)

FO: 'Suppression direction 4170, distance 2935, vertical angle plus 07, over."

FDC: (Reads back.)

FO: "Mark direction 4820, distance 2450, vertical angle plus 02, over."

FDC: (Reads back.)

FO: "Suspected AAA site, interrupted, CAS TTT six plus zero, zero., . stand by.

hack, over."

FDC: "Suspected AAA site, interrupted, CAS TTT six plus zero, zero, out."

FOC: D2T this is W6T, 92 rounds, VT, TOF 42, over."

FO: (Reads back.)

Figure 8-11. Example of SEAD Call for Fire Using Timing

Separation and Elapsed Time.
8-26

Immediate SEAD Decisions

Mission: CH-53 TRAP mission low-level flight crossing GTL

Targets: Two suspected ZU-23s 1,000 meters beyond landing zone;

location by grid method

System/unit: Artillery/battery one (W6T) Mark: None

Ordnance: HENT high angle

Separation method: Altitude and lateral

Duration/volume: From two minutes before until one minute after L-hour

Timing: L-hour on synchronized clock

Immediate SEAD Call for Fire

FO: "W6T this is D2R, SEAD, over."

FDC: (Reads back.)

FO: "Grid to suppress 465 729, over."

FDC: (Reads back.)

FO: "Suspected ZU-23, high angle, minus two through plus one, L-hour 1745, over."

(Reads back.)

FOC: "D21 this is W6T, seven rounds, VT, TOF 67, over."

FDC: (Reads back.)

FO:

USU UU U U• US U U

U•US•••UUUS5•5 *• ______

-+111111 -2.0 -1.5 10 -0.5 1745 "0.5 +1.0 *1.5 +

4

TRAP 1.-Hour Suppression

Figure 8-12. Example of SEAD Call for Fire Using

Altittfde/Lateral Separation and Synchronized Clock.
(4) Method of Engagement. The munition for SEAD suppression

will be standardized and fired unless another shell/flize

combination is requested. Depending on the terrain and maneuver

requirements, either DPICM or HE/VT will be used. Both are

effective against personnel in the open (e.g., air defense gunners)

and against air defense fire control and radar devices on antiaircraft

artillery (AAA) and surface-to-air missiles (SAMs). DPICM is

more effective in terms of size and probability of area coverage.

However, HE/VT may be preferable in forested or future maneuver

areas. WP/PD (fuzed to impact on the ground) is the standard

munition for marking and will be fired unless another shell/fuze

combination is requested. WP is a good general-purpose marking

munition because it provides a reliable quick-building burst, is

distinguishable from HE bursting in the battlespace, and remains

visible for many seconds. Other shelllfuze combinations that may

be effective in suppressing enemy air defenses and marking CAS

targets include the following.

(a) Illumination. Illumination fuzed to burn on the deck is an

effective mark. Illumination marks can affect FUR systems. At

night, this light is generally too intense for aircrews operating with

night vision devices. Illumination can also be employed for

suppression to confuse the acquisition systems of heat-seeking

missiles such as the SA-7/14, SA-9/13, and SA-l6. It can also

produce some confusion for radar guidance systems. Illumination

flares in the air during an aircraft's ordnance delivery can confuse

antiair radar and infrared-seeking missiles. The optimum HUB of

the illumination flare for suppression is 300 to 400 meters above

ground level in between CAS and the suspected ADA position.

8-27
8-28

(b) Smoke. Smoke can be used to hinder optical acquisition of

CAS aircraft by the encmy. The use of smoke will interfere with

optical acquisition systems of small arms, machine guns, and most

AAA and tactical SAMs. Smoke must be positioned so as not to

hinder the pilot's ability to acquire the target or marking round. If

an enemy ADA unit is located well enough to obscure, it is

preferable to destroy it.

(5) Method of Fire and Control. The method of fire and control

includes instructions for timing and duration of SEAD fires. For

immediate SEAD fire missions, the aircraft event time (e.g., CAS

TOT/TTT, assault support L-hour, UAV mission area arrival time,

etc.) serves as the basis, or zero hour, from which artillery fires are

scheduled. Fire and control instructions include the starting and

ending times for suppression fires and the aircraft event time from

which fires are timed. The standard suppression times are

expressed as either "interrupted" or "continuous." "Nonstandard"

includes plus or minus minutes from zero hour, for example,

"minus two through plus one." More than one interval of

suppression fires may be specified if SEAD fires are nonstandard,

for example, "minus two through minus one, plus one through plus

two." Aircraft event times should be expressed as a time on the

synchronized clock, for example, "CAS TOT 1305." If a

synchronized clock is not available, express aircraft event time as

an elapsed time, for example, "CAS TTT six plus zero, zero .

stand by, hack," or in relation to another event, for example,

"H-hour plus 10 minutes." Refer to appendix D for instructions on

establishing and communicating synchronized and elapsed times.
b. Message to Observer. The artillery unit will transmit a normal

MTO. In addition, TOF should be requested to allow observers to

determine that fires will impact as desired.

8009. Naval Gunfire SEAD. For NGF SEAD support of aircraft

missions, the terminal controller (e.g., FAC) coordinates aircraft

routing, required suppression and marking, and timing with the NGF spotter. The spotter, in turn, determines the NGF

requirements to protect aircraft from both enemy air defenses and

friendly fires and passes this information to the naval surface fire

support (NSFS) ship in the form of a call for fire (there is no

standard call for fire for NGF SEAD; the spotter tailors it for each

specific mission). The FSCC monitors these radio transmissions

and ensures that the timing and effects of these SEAD fires are

coordinated with other operations of the unit. The NGF SEAD call

for fire is based on the standard call for fire format. (See figures

8-13 and 8-14 on pages 8-30 through 8-31.) Calls for fire may

include instructions for marking rounds if required.

a. Call for Fire

(1) Warning Order and Target Number. SEAD fire requests are

identified in the warning order, for example, "SEAD fire mission."

The spotter identification, warning order, and target number

constitute the first transmission of the call for fire.

Example

"T4R this is E3P, SEAD fire mission, target number NZ 3101, over."

8-29
8-30

Immediate SEAD Decisions

Mission: CH-46 assault support inserted away from GIL

Targets: One suspected ZPU-4 along flight route, one suspected AAA site

800 meters from landing zone; location by grid method

System/unit: NGFIUSS OBannon DD-987 (V4G)

Mark: None

Ordnance: HE/CVT (standard)

Separation method: Lateral

Duration/volume: First target: three minutes before to two minutes before L-hour;

second target: one minute before to one minute after L-hour

Timing: L-hour at 1510 on synchronized clock

Immediate SEAD Call for Fire

Spotter: "V4G this is C5E, SEAD fire mission, target numbers AF 0015 and AF 0016,

over."

Ship: (Reads back.)

Spotter: 'Suppression grid 716 532, altitude 90, suspected ZPU-4, minus three

through minus two, suppression grid 765 567, altitude 80, suspected AAA

site, minus one through plus one, negative mark, L-hour 1510, over."

Ship: (Reads back.)

Ship: 'AF 0015 GIL 1140, summit 1000, ready 16, over."

Spotter: (Reads back.)

Ship: 'AF 0016 GIL 1420, summit 1100, ready 19, over."

Spotter: (Reads back.)

S....

£#1

h.

.! ' ! ! ±

' 4

4

L.HOS Suo.,....on S.pcre$a. AFt5 AFOOI6 Figure 8-13. Example of SEAD Call for Fire Using Lateral

Separation and Synchronized Clock.
8-31

Immediate SEAD Decisions

Mission: F/A-i 8 CAS low-level attack

Targets: Suspected AAA site near CAS target; location by polar method

System/unit: NGF/USS Leftsvich DD-984 (Y2P)

Mark: NGF

Ordnance: SEAD HEICVT; mark WP/PD (standard)

Separation method: Timing

Duration/volume: From one minute before until 30 seconds before CAS TOT

(standard interrupted SEAD program)

Timing: Elapsed time (TT)

Immediate SEAD Call for Fire

Spotter: "Y2P this is C5E, SEAD fire mission, target numberAF 0017, over."

Ship: (Reads back.)

Spotter: "Suppression direction 5640, distance 3600, up 40, suspected AAA site,

interrupted, mark direction 5670, distance 3800, over."

Ship: (Reads back.)

Spotter: "CAS TTT 10 plus zero, zero. . . stand by.. . . hack, over."

Ship: "CAS TTT 10 plus zero, zero, out."

Ship: "Suppression GTL 1310, summit 900 feet, ready 12, over."

Spotter: (Reads back.)

Ship: "Mark GTL 1290, summit 900 feet, ready 12, over."

Spotter: (Reads back.)

Figure 8-14. Example of SEAD Call for Fire Using Timing

Separation and Elapsed Time.
8-32

(2) Target Location. Use the most accurate method of target

location fo:r the situation at hand. The target location element of the

call for fire must include the suppression target location(s) and, if

required, the location for a munition marking round. In the call for

fire, all suppression target information, that is, target location,

target description, method of engagement, and method of control,

should be stated before information is given on a second

suppression target or the mark target. Target locations are specified

by stating "suppression" followed by the location and "mark"

followed by the location or "negative mark" if no mark is desired.

(3) Target Description. Target description is provided as in the

standard call for fire. Enemy air defense positions should be

identified as known or suspected to assist in developing enemy

intelligence information.

(4) Methodl of Engagement. The standard method of engagement

for SEAD suppression is HE/C VT, one gun, sustained fire, interval

10 seconds for suppression. For NGF marks, the standard is

WP/PD fired to impact at 20 to 30 seconds before the aircraft event

time. These standards will be fired unless another method of

engagement is specifically requested. The effects of NGF HE/C VT

are similar to those of artillery HE/VT. Because some ships may

not carry WP, illumination may have to be used as a mark.

Illumination marks should be timed to burst 45 seconds before the

aircraft event time and fuzed to burn on the deck. The effects of

NGF illumination are similar to those of artillery illumination.
The method of engagement includes instructions for timing and

duration of SEAL) fires. Engagement instructions include the

starting and ending times for suppression fires relative to the

aircraft event time. The aircraft event time is stated in the method

of control element of the call for fire. Suppression times are

expressed as plus or minus minutes from zero hour, for example,

"minus two through plus one." More than one sequence of

suppression fires may be specified if fires on that target must be

interrupted, for example, "minus two through minus one, plus one

through plus two." To abbreviate the SEAD call for fire to support

CAS missions, two standard programs are established for typical

SEAD scenarios.

(a) Continuous SEAD. The continuous SEAD program may be

used when separating aircraft and SEAD fires by distance. This

program is generally effective when the SEAL) target is in the

vicinity of the CAS target and SEAL) fires will not endanger CAS

aircraft. Continuous SEAD fires are delivered during the critical

portion of the CAS aircraft's attack phase and egress, specifically

from one minute before the CAS TOT/TTT until one minute after

the CAS TOT/TTT. This program is requested by stating

"continuous" instead of desired suppression times.

(b) Interrupted SEAD. The interrupted SEAD program may be

used when separating aircraft and SEAL) fires by time. This

program is generally effective against SEAD targets that are the

same as or close to the CAS target and in which SEAD effects or

trajectories may endanger CAS aircraft. Interrupted SEAD fires are

delivered during the critical portion of the CAS aircraft's attack

8-33
8-34

phase, specifically from one minute before the CAS TOT/TTT

until 30 seconds before the CAS TOT/TTT. This program is

requested by stating "interrupted" instead of desired suppression

times.

(5) Method of Control. For immediate SEAD NGF missions,

control instructions must include the aircraft event time (e.g., CAS

TOT/TTT, assault support L-hour, UAV mission area arrival time,

etc.), which serves as the basis, or zero hour, from which NUF is

scheduled. Aircraft event times should be expressed as a time on

the synchronized clock, for example, "CAS TOT 1305." If a

synchronized clock is not available, express aircraft event time as

an elapsed time, for example, "CAS TTT six plus zero, zero

stand by, hack," or in relation to another event, for example,

"H-hour plus 10 minutes." Refer to appendix D for instructions on

establishing and communicating synchronized and elapsed times.

The target location, target description, method of engagement, and

method of control constitute the second transmission of the call for

fire. Once instructions for a target are begun in this transmission,

spotters should complete the location, description, and method of

engagement for that target before providing instructions for another

suppression target or a mark target, for example, "suppression"

first target location, description, and method of engagement;

"mark" location and method of engagement. Because of the length

of this transmission, information should be transmitted as it is

determined, and elapsed times (TTT and hacks) should be sent as a

third transmission.
Example

Suppression grid 765 567, altitude 80, suspected SA-6, minus two through

plus two, mark grid 762 575, altitude 50, CAS TOT 1305, over."

b. Message to Observer. The NSFS ship will transmit a normal

MTO including the GTL, summit, and TOF. In addition to "shot,"

"splash" should be transmitted to assure spotters that fires will

impact as desired.

(reverse blank)

8-35

Chapter 9

Laser Designators and Laser-Guided Weapons Systems

An LGW system consists of ground and/or airborne designators

used with surface- or air-delivered laser-guided munitions. These

systems include laser designators/rangefinders, laser acquisition

devices or seekers, laser-guided munitions, and delivery platforms.

LGW systems are used by artillery FOs, NGF spotters,

reconnaissance personnel, FACs, aerial observers, and aircraft

pilots. This chapter will focus on the LGW systems employed by

the ground observer, spotter, or terminal controller in support of

the MAGTF. Additional discussion is contained in Joint Pub

3-09.1.

9001. Purpose. LGW systems provide combat units with a means

of accurately locating and engaging high-priority stationary and

moving point targets with first-round hit probability. They also

allow for faster location and attack of the target. Artillery, ships,

and aircraft can be provided with accurate target data to attack the

target effectively with conventional munitions as well. The coded

laser beam provides positive control between the air and the

ground.

9002. Basic Requirements. The five basic requirements for using

laser designators with laser acquisition devices or laser-guided

munitions are as follows:

9-1
9-2

• Line of sight must exist between the designator and the target

and between the target and the laser acquisition device.

• A PRF code is used for the laser designator, the laser seeker,

and the laser-guided munition. Each must use the same code

when operating together.

• An agreement on a direction of attack is necessary. The laser

seeker or laser-guided munition must be able to sense the

reflected energy from the laser designator.

• The laser designator must be designating the target at the correct

time.

• The delivery system must release the munition within the

specific munition delivery envelope.

9003. Laser Emission Systems. Laser target ranging and

designation systems provide accurate range, azimuth, and elevation

information for use in locating enemy targets or other positions.

These systems vary from handheld rangefinders and pointers to

aircraft-mounted designators. Laser designators provide the energy

source that is reflected from a designated target to provide terminal

guidance for laser-guided munitions. These systems emit discreet

pulses of infrared energy that are invisible to the naked eye. The

characterist:ics of these pulses are determined by a PRF code of

laser energy, which can be set by a series of switches on the

equipment. Laser designators/rangefinders within the Marine

Corps include the MULE and the laser infrared observation set

(AN/GVS-5).
a. Modular Universal Laser Equipment. The MULE

(AN/PAQ-3) is a laser designator/rangefinder that is capable of

designating moving targets to a range of 3,500 meters or stationary

targets to 5,000 meters. Maximum range-finding capability is

9,990 meters. The MULE system has a north-seeking capability

that allows self-orientation for direction, easier self-location, and

readout for both grid and true azimuths. It is capable of detecting

multitarget reflections. The MULE can be operated during periods

of darkness or reduced visibility at slightly reduced ranges by use

of the night vision set. It can interoperate directly with the digital

message system. It can also be used in conjunction with the PLOR

or the Position Location Reporting System (PLRS) to provide

accurate observer and target location.

b. Laser Infrared Observation Set (ANIGVS-5). The AN/GVS-5

is a handheld, battery-operated laser rangefinder. It can provide

only range to a target. It cannot designate targets for laser-guided

munitions. The AN/GVS-5 has a 7 by 50 monocular sighting

system. Accuracy is dilO meters for distances of 200 to 9,990

meters. It can provide a maximum of 100 range readouts per

battery charge. It is capable of detecting multiple target reflections.

c. Laser Target Designator/Ranger Pod. The F/A-18C/D is

capable of carrying the AN/AAS-38 laser target designator/ranger

(LTD/R) pod, which provides two functions. Its laser designator

provides terminal weapons guidance for all laser-guided munitions

and designates targets for airborne coded laser acquisition/spot

trackers. The F-14 is capable of carrying the LANTIRN system.

With LANTIRN, the F-14 has an accurate, autonomous

9-3
9-4

designation and targeting capability for delivery of laser-guided

bombs. This system is effective during the day or night and at high

altitudes.

d. Night Targeting System. The AH-1W attack helicopter

contains the Night Targeting System (NTS), which provides

LTD/R capability, as well as FUR visual capability and video

capture. It performs the same functions as the LTD/R pod for

fixed-wing platforms.

e. Illumination Devices. Handheld lasers emit infrared light for

compatibility with NVGs. These devices can either flood infrared

light within 1,000 meters to enhance general NVG performance or

focus a small beam up to 4 kilometers to pinpoint a specific target

with an in:frared light beam for any weapons system employing

NVGs. They are not capable of designating for a laser-guided

munition.

9004. Laser Acquisition Devices. Laser acquisition devices

(seekers/spot trackers) are used to acquire reflected laser energy

from laser-designated targets. They are installed in aircraft for

target acquisition or in laser-guided munitions for terminal

guidance. Laser acquisition devices allow visual acquisition of a

coded laser-designated target. They must be set to the same PRF

code as the laser designator for the user to see the target being

lased. There are two types of laser acquisition devices. Note that

the AH- 1W has the capability to use onboard HELLFIRE

munitions as an improvised laser spot tracker before firing. See

appendix F for all laser spot tracker-equipped aircraft.
a. Laser Acquisition/Spot Tracker Pod. The coded laser

acquisition/spot tracker can be carried on the F/A-18AJC/D. Once

it acquires the laser spot (target), it passes necessary ballistic

information to allow FUR or radar acquisition of the target and

visual display. Desired PRF codes are in-flight selectable. It then

employs LGWs or executes visual deliveries of nonlaser ordnance.

b. Angle Rate Bombing System. The angle rate bombing system

(ARBS) is used on the AV-8B. It consists of a three-axis gimbaled

television/laser spot tracker, which enables a view of the laser spot.

It provides day or night attack and reattack information for either

LGWs or nonguided bombs. The system allows in-flight selection

of PRF codes but is affected by smoke or obscurants.

9005. Laser-Guided Munitions. These munitions home in on

reflected laser energy during the terminal portion of the attack.

Such munitions are part of the precision-guided munitions (PGM)

family, which includes Copperhead, HELLFIRE, Maverick, and

laser-guided bombs.

a. Copperhead. Ground or airborne designators can designate

Copperhead targets. The best use of the Copperhead is against

high-payoff targets outside the range of maneuver direct-fire

weapons (more than 5,000 meters from the ground observer).

Single or multiple targets may be engaged within a Copperhead

engagement area. The Copperhead is a 1 55-mm cannon-launched,

antitank, laser-guided projectile. The body of the projectile

contains fins and wings, which deploy in flight to allow the

projectile to maneuver. The Copperhead is fired in either the

9-5
9-6

ballistic or shaped-trajectory mode. Upon reaching a point on its

descending trajectory, the projectile acquires the reflected laser

energy from the designator and maneuvers to the designated target.

It has a maximum range of 16,800 meters and a minimum range of

3,000 meters. It requires at least 13 seconds of laser designation to

acquire and maneuver to the target.

b. Maverick. The Maverick is an air-launched, air-to-ground

missile that is available in a laser-guided variant and an

infrared-seeker variant. It can be employed on the AV-8B, A-10,

F-15, F-16, and F/A-18 aircraft. It can be used against field

fortifications, SAM sites, and armored vehicles. The missile

requires lock on before launch and continual designation during

flight. Once the Maverick is launched, the aircraft can break away

or launch another missile. The PRF code is cockpit selectable.

c. Helicopterborne Fire and Forget Missile. HELLFIRE is an

air-launched[, laser-guided, antiarmor missile launched from the

AH-IW, AH-64, and OH-58D aircraft. It can be employed in

indirect (lock-on after launch) or direct (lock-on before launch) fire

methods. HELLFIRE can be launched in four firing modes: one

missile (single), two or more missiles on the same code (rapid),

two or more missiles launched on different codes using multiple

laser designators (ripple), or multiple codes and designators used in

a combination of rapid and ripple fire. The PRF code is cockpit

selectable.

d. Laser-Guided Bombs. The MK-82, MK-83, and MK-84 are

designations for the 500-, 1,000-, and 2,000-lb bombs that can be
converted to the GBU-12, GBU-16, GBU-lO, GBU-22, GBU-23,

and GBU-24 laser-guided bombs. These bombs use common laser

guidance and control subassemblies with only the aerodynamic

surfaces changed to match the particular size of warhead. They can

be employed in a standoff capacity. The PRF codes must be set

before aircraft launch.

9006. Laser Energy Reflectivity. Laser energy is reflected in

various ways, depending on the nature of the reflecting surface, the

angle at which the laser energy strikes the target surface, and the

laser beam divergence. This information is important in

determining where the laser acquisition/tracking device or seeker

needs to be to acquire and home in on the reflected energy spot.

a. Laser Spot Size. The laser energy or beam increases in size at a

constant rate from its source. This spreading is a function of the

designator itself and the distance to the target being designated.

This is called beam divergence. Figure 9-1 on page 9-8 shows the

effect of distance on spot size. For the MTJLE, the laser energy spot

size can be estimated for any distance by using the following rule

of thumb: spot size is equal to three inches plus eight times the OT

distance (in thousands of meters).

Example

01 distance = 3,000 m

MULE spot size = 27 in (3 in + (8 x 3) = 27 in)

9-7
9-8

b. Target Surface Reflectivity. Targets contain a combination of

mirrorlike (e.g., windshields, windows, and shiny metal) and

low-reflectivity surfaces. Mirrorlike surfaces should not generally

be designated because the reflective energy does not spread

sufficiently to allow the seeker to acquire it. Certain materials are

better reflectors of laser energy than others. Targets with greater

reflectivity increase the probability of a laser seeker picking up the

laser spot. Attack headings for air-delivered munitions should be

outside the safety zone—the area 10 degrees (180 mils) on either

side of the laser designator. LOWs launched within the 20-degree

(360-mu) safety zone could receive false target indications and

acquire the designator. The safest acquisition area for an LGW is

more than 10 degrees (20 mils) but less than 60 degrees (1,100

mils) off the laser target line. This provides a 50-degree (900-mil)

cone to either side of the laser target line for an ideal attack

heading as shown in figure 9-2 on page 9-9. Terminal controllers

employing laser designators must provide aircrews with an attack

heading within that cone.

Figure 9-1. Modular Universal Laser Equipment Spot Size.
Best

Acquisition

Area (500)

Figure 9-2. Safety Zone and Optimal Acquisition Area for

Delivery of Laser-Guided Weapons.

The best results are normally obtained when designated targets

reflect the beam upward and toward the incoming seeker or

munition. The amount of laser energy that is reflected from a target

is difficult to determine and is material dependent. (See table 9-1

on page 9-10.)

9-9

Best

Acquisition

Area (500)

Offset

—--;1=g

Best IP Area
9-10

Table 9-1. Energy Reflection.

Material Reflectivity Percentage

Brick 55-90

Vegetation 30 - 70

Unpolishd aluminum 55

Olive drab metal (dirty) 2 - 30

Asphalt 10-25

Concrete 10 - 15

Water 2

c. Energy Reflection on Various Surfaces. A brief description of

how the energy is reflected from various types of surfaces follows.

(1) Mirrorlike Reflections. The laser energy reflects in a narrow

path from flat, bare, shiny metal as well as glass surfaces as shown

in figure 9-3 on page 9-11. Any seeker looking for this laser energy

would have to be in this narrow area of reflection to acquire the

spot. These surfaces are not suitable for laser designation.

(2) Scattered Reflections. Laser energy scatters in a large

spherical arc from flat, low-reflectivity surfaces. (See figure 9-4 on

page 9-11.) These surfaces are suitable for laser designation.

(3) Spillover. Laser energy spillover occurs when the laser spot is

larger than the target. It is usually caused by beam divergence but

may be caused by a careless designator operator. Reflections from
objects near the target may occur. (See figure 9-5 on page 9-12.)

When this happens, the seeker may acquire the wrong spot.

Figure 9-3. Mirrorlike Reflections.

Figure 9-4. Scattered Reflections.

9-11

Angular Reflection

J1TTT..

Perpendicular Reflection
9-12

(4) Blocked. If the seeker is not in the proper position, laser energy

reflections from the target can be blocked from the seeker by

intervening objects or by thetarget itself. (See figure 9-6.)

Figure 9-6. Blocked Reflection.

(5) Absorbed. Aiming the designator into tunnels and other targets

causes laser energy to be absorbed. Instead, the operator must aim

the designator slightly above a tunnel opening; this would allow a

munition to impact at that critical point. For munitions like

laser-guided bombs that tend to impact short of the point being

Figure 9-5. Laser Spillover.
designated, this type of designation could guide the bomb into the

tunnel opening. (See figure 9-7.)

a. Laser Designator Planning Factors. Based on the

commander's guidance, the observer must consider the following

factors when employing the MULE:

• Environmental conditions

• Designator location relative to target and delivery system

• Laser designator aiming points

• Communications

• Mobility.

9-13

Figure 9-7. Concave Targets.

9007. Laser-Guided-Munition Planning
9-14

b. Mission Execution/Employment Factors. In addition to the

five basic requirements established in paragraph 9002., the

observer must also consider the following key factors when

employing laser-guided munitions.

(1) Enemy Countermeasures. Judicious use of laser target

designators will limit the enemy's countermeasures capability.

(2) Battlespace Obscuration. The effects of smoke, dust, and

debris can impair the use of laser-guided munitions. The reflective

scattering of laser light by smoke particles may present false

targets. The operator can use night sight, alternate positions on

higher ground, and alternate designators to reduce smoke effects.

(3) Terrain/Vegetation. Irregular terrain and vegetation will affect

line of sight.

(4) Weather. Rain, snow, fog, and low clouds can prevent

effective use of laser-guided munitions. Heavy precipitation can

limit the use of laser designators by affecting line of sight. Snow

on the ground can produce a negative effect on the accuracy of

laser-guided munitions. Extreme temperatures (below 32 degrees)

can affect MULE battery life and may require the use of an

external power adapter. In low temperatures, placing the battery

close to the body under heavy clothing will help to preserve its life.

Fog and low clouds will block the laser-guided-munition seeker's

field of view, reducing the guidance time. This reduction may

affect the hit probability.
(5) Darkness. Targets are more difficult to locate, range, and

designate during periods of poor visibility.

(6) Target Shape. Poorly defined targets such as caves and tunnels

may absorb the laser spots.

(7) Seeker/Laser Designator Alignment. The direction of

attack/GTL must be within the allowable mission attack angle.

Laser-guided, air-launched munitions should attack the target

within 60 degrees (1,100 mils) to either side of the designator

target azimuth. (Some munitions may require a smaller angle.) The

closer the weapon approach angle is to the designator target

azimuth (provided it is at least 10 degrees (180 mils)), the greater

the probability of target acquisition and hit. Copperheads require

an angle of no greater than 45 degrees on either side but do not

require an exclusion, or safety, zone.

(8) Communications. Positive communications between the

terminal controller/observer and the delivery aircraft/unit are

required to coordinate the proper PRF code, the seeker/laser

designator alignment, and target designation timing.

(9) Safety. The invisible laser beam is intense infrared radiation,

which can cause serious eye damage and blindness.

(a) During peacetime, the use of laser-guided munitions imposes

strict safety requirements during training exercises. Operators must

adhere to range and unit safety SOPs when employing laser-guided

munitions.

9-15
9-16

b) During combat, the operator must take care to avoid friendly

casualties from indiscriminate laser designation. Caution should

also be taken in designating specular surfaces, which can cause

dangerous reflected beams. The use of binoculars and similar

optical deviices during airborne or ground lasing greatly increases

the possibility of eye damage. Ground troops in the target area

should use safety goggles when working with aircraft that can

designate targets. The terminal controllers must be aware of

friendly front lines when planning the attack heading for aircraft

ordnance delivery.

c. Seeker Lock-on to Designator. Laser seekers may occasionally

lock on to the designator instead of the target. Intervening grass or

leaves, for example, could reflect sufficient laser energy to cause

seeker lock-on. To prevent seeker lock-on to the designator

position, the designator should be masked from the seeker's field

of view by terrain, vegetation, or a temporary screen such as

blankets or a tarp. When the seeker's progress indicates a seeker

lock-on to the designator, it may be possible to prevent a mishap

by aborting the aircraft's bombing run or by turning off the

designator.

d. Pulse Repetition Frequency Codes. Laser coding permits the

simultaneous use of multiple laser designators and laser-guided

seekers/weapons. Laser designators and seekers use a PRF coding

system to ensure that a specific seeker and designator combination

works in harmony. By setting the same code in both the designator

and the seeker, the seeker will track only the target that is

designated with that code.
(1) Code Description. The system uses either a three- or four-digit

numeral system, depending on the type of laser equipment.

Three-digit settings range from 111 to 788, and four-digit settings

range from 1111 to 1788. All three- and four-digit

designators/seekers are compatible. When employing three- and

four-digit designators/seekers, the first digit of the four-digit code

must always be set to one. The remaining digits of the two systems

must then match. For example, a four-digit code of 1657 would be

compatible with a three-digit code of 657.

(2) Code Allocation and Assignment. LGW system codes are

controlled and coordinated. At the MAGTF level, different blocks

of codes are assigned to artillery, air, and NGF to prevent

interference between supporting arms activities. Each supporting

arm then assigns codes to its subordinate units for individual

missions. It also changes codes periodically as the situation

requires. Subordinate FSCCs provide positive coordination of the

code settings through the various fire support representatives. For

individual missions, the munition delivery system (artillery, ships,

aircraft) employs the codes. For CAS, codes are ultimately

assigned to each flight so that no two flights are in the air at the

same time with the same code. When an aircraft is on station, the

pilot passes the code to the terminal controller. The terminal

controller then coordinates with the MULE operator to ensure that

the MULE is set to the same code as the aircraft. Individual aircraft

may carry LGWs with different preset codes to accommodate

multiple aircraft attacks or multiple weapon releases or to allow

variation in codes used on consecutive attacks.

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9-18

(3) Security. PRF codes are handled in the same manner as other

classified material. Secure means should be used, if available,

when the codes are passed between laser designators and the

munition delivery unitlaircraft. However, the absence of

compatible secure means should not normally dictate the

termination of a laser-guided munition attack. In certain situations,

codes will be prebriefed.

e. Effect on Mission. The adverse effects of the mission

executionlemployment factors can often be overcome by skillful

employme:nt of the designators. Enemy countermeasures can be

minimized by aiming the laser designator at an object near the

target instead of directly on target (offset designation).

Laser-guided munitions can be employed against high-priority

targets early in the battle before smoke and dust obscure the

battlespace. Targets downwind can be attacked first if priorities

permit. Use of preplanned aiming points and laser-guided munition

footprints can help to overcome effects of obscuration, weather,

vegetation,, and terrain. Use of a night sight on the designator will

overcome the effects of darkness and can assist during periods of

poor visibility and inclement weather.

9008. Methods of Employment. Laser-guided munitions are

employed in the ground and airborne modes.

a. Ground Mode. Ground laser designators identify targets for

artillery, NGF, and aircraft-delivered munitions. MULE-equipped

teams can employ laser-guided munitions from all delivery means

requiring laser designation. Standard calls for fire are used, but the
laser code must be exchanged between the ground designator and

the firing unit or the aircraft.

b. Airborne Mode. Airborne laser designators identify targets for

artillery, NGF, and aircraft-delivered munitions. Airborne

designator systems operating in support of ground maneuver forces

have the ability to employ all types of laser-guided munitions.

Standard calls for fire or requests for air support are used, but the

code being used must be exchanged.

9009. Employment Considerations

a. Designator Aiming Point Considerations. The range, size,

shape, reflectivity characteristics, location, and motion of a target

all have a bearing on the technique of employing a laser designator.

When lasing a target by using a night sight device, the operator

must be trained. As an example, the operator should know that the

infrared signature of a target will be at the highest concentration of

heat. In the case of a moving vehicle, this heat concentration will

be slightly behind the designated lasing point of the target.

Generally speaking, a flat surface is the most favorable surface for

designation because it is perpendicular to the direction of the

incoming ordnance. If there is not a flat surface, then a curved or

irregular surface facing the direction of the incoming ordnance will

generally be a satisfactory aiming point.

b. Technique. The distance from the laser to the target determines

the size of the laser spot. To reduce spillover, the MULE should be

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9-20

aimed so that the spot projects partially in front of the target with

the remainder on the target.

(1) Target and Laser Spot Size. If the target is larger in size than

the laser spot, a point on the target should be selected at which to

place the spot. The point selected should optimize conditions for

spot tracking and weapon guidance. The direction from which the

attack will be made and the shape, angular relationship, and

reflectivity of the target surface must be considered. In situations

where the laser spot is quite small, care must be taken not to aim

the laser into an opening because the opening will absorb the

reflected energy.

(2) Masked or Obscured Targets. If the operator suspects that the

target may be partially masked from the view of the incoming

seeker, he should aim the laser at a point on the target that he

believes will be within line of sight of the seeker. In situations

where the target is concealed, it may be necessary to aim the laser

spot at some overhead or nearby object. For example, in

designating a vehicle under a tree, the laser spot can be positioned

in the foliage overhead.

(3) Moving Targets. In tracking a moving target, the operator may

have to designate a point near the target and wait until the target

moves into the designated spot. If the target moves out of sight

during lasirtg, the laser spot may be shifted to another target in the

vicinity. If the laser spot tracker or laser-guided ordnance has

already locked on, the spot should be moved slowly to the new

location to avoid interrupting the laser output.
(4) urvivabi1ity. For observer survivability, designation time

should be minimized. Minimizing the designation time will reduce

the time available for the enemy to detect, locate, and suppress the

designator. The operator may lase a spot a distance away from the

target and walk the spot to the target for the terminal portion of the

attack. This technique is called offset laser designation. It

minimizes laser on-target time and requires that the operator be

advised of the progress of the attack to ensure that the spot is on

target at the proper time. The operator must not move the spot

through any location that is masked from view by the attacking

aircraft or guided ordnance.

(5) Power Sources. Designation time should also be minimized to

conserve MULE battery life. The life span of recharged batteries is

variable arid often short. A fresh battery should be installed when

preparing to designate targets. Likewise, even under vehicular

power, it is possible to damage MULE components by continuous

lasing; the duration of continuous designation should not exceed

one minute.

c. Designator Operator Positioning Considerations. The MULE

operator selects his position based on line of sight, cover and

concealment, maximum coverage of operations, and

communications requirements. Next, the MULE operator

determines the standoff distance. Standoff distance must be

properly used when observing enemy avenues of approach and

chokepoints. The vulnerability of the designators must be

considered when designating point targets such as tanks, BMPs,

and guns. Although standoff may increase survivability of the

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9-22

designator, the operator must be aware that the beam divergence at

long standoff ranges could preclude effective point-target

designation. The operator should select positions that are near

expected locations of high-priority targets while minimizing risks

to friendly forces. The site(s) must be coordinated with the

positioning of other antiarmor weapons, such as the tube launched,

optically tracked, wire command link guided missile (TOW) and

Dragon. All antiarmor weapons, including the. MULE, must be

deployed to ensure mutual support and coordination. To increase

survivability of the MULE, the observer should consider hardening

the site, for example, with a pit similar to a machine gun horseshoe

pit. Deployment of the MULE can be accomplished by manpack,

vehicle, or helicopter.

9010. Copperhead Engagement Characteristics. The capabilities

of the Copperhead are coupled with certain delivery requirements.

These do riot negate the effectiveness of the Copperhead, but are

important in planning Copperhead engagements. Factors that must

be considered for a successful Copperhead mission include:

• Visibility requirements

• Engagement footprint

• Target mobility.

a. Minimum Visibility Requirements. Visibility requirements

include the observer's laser visibility of the target and the

Copperhead's visibility of the reflected laser energy. The

maximum effective range for designating stationary targets with
the MULE is 5,000 meters; for moving targets, the range is 3,500

meters. Airborne platforms can designate from greater distances;

however, the munition itself has a minimum visibility requirement

of 5,000 meters. The operator can use the M1JLE to range the

farthest visible terrain feature and determine its distance. If the

distance measured is 5,000 meters or greater, the minimum

visibility requirement is met. Minimum visibility should be

updated periodically and transmitted to the FDC.

b. Time of Flight/Angle T. The Copperhead's additional visibility

requirements are based on the TOF, angle T, and cloud height.

During the last 13 seconds of the Copperhead's flight, the round

acquires the laser energy reflected from the target and begins

maneuvering toward it. The target, or offset aim point, must be

continuously lased during this period. The minimum range from

gun to target of 3,000 meters guarantees the minimum 13-second

TOF needed to acquire and maneuver to the target. The angle T

between the observer and GTL must be 800 mils or less. This

ensures an adequate angle for the Copperhead to acquire reflected

laser energy. There is no requirement for a 20-degree exclusion

zone with the Copperhead. TOF and angle T are provided in the

MTO for Copperhead missions. The other factor affecting

Copperhead visibility is cloud height.

c. Observer Cloud Height. Target cloud height significantly

affects the performance of the Copperhead round. Cloud ceilings

that are too low will not allow the Copperhead round enough time

to lock on and maneuver to the designated target. Besides reporting

his location to the FDC, the operator must report the cloud height

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9-24

from his position whenever Copperhead munitions are available.

The FDC uses the reported observer cloud height to compute the

best trajectory for acquiring the target. If the observer believes that

the cloud coverage has changed significantly, he should update the

FDC. The following procedures are used to determine operator

cloud height.

(1) Elevate the MULE to a vertical angle of +300 mils toward the

area of responsibility. Select the range mode on the rangefinder

and measure the slant range to the cloud base.

(2) Express the slant range to the nearest 100 meters (for example,

2,570 meters = 2,600). If the slant range is greater than 6,300

meters, the operator reports "operator cloud height greater than

1,890 meters." (1,890 meters cloud height corresponds to a range

of 6,300 meters.) If the slant range is equal to or less than 6,300

meters, the operator uses the cloud height table in table 9-2 on page

9-25 to determine the cloud height.

i3) Enter the table on the left side with the nearest listed value less

than or equal to the slant range. Note the difference between the

entry range and the expressed range. For example, for an expressed

range of 2,600, enter the table on the left side at 2,500. The

difference is 100 meters.

(4) Enter the table from the top, using the difference between the

entry range and the expressed range resulting from step 3. Using

the example in step 3, the table would be entered in the column

labeled "100."
Table 9-2. Operator Cloud Height.

Range (m) 0 :;:.

450 480

600 630

750

200 300 400

1 500 510 540 570

2 000

2500

660 690 720

810 840 870

3,000 900 930 960 990 1,020

3,500 1,050 1,080 1,110 1,140 1,170

4,000 1,200 1.230 1,260 1,290 1,320

4,500 1,350 1,380 1,410 1,440 1,470

5.000 1,500 1,530 1,560 1,590 1,620

5,500 1,650 1,680 1,710 1,740 1,770

6,000 1,800 1,830 1,860 1,890 1,920

Notes: 1. A similar table is on the cover card of the Copperhead

footprint template set. Do not use that table because it

was designed for the ground/vehicle laser locator designator's

maximum elevation of +350 mils, which the MULE cannot

reach.

2. The operator should report cloud height as soon as

possible after occupying a position. He should then report

changes only when the change in operator cloud height

exceeds 100 meters.

3. An increase or decrease of 300 meters in measured

slant range corresponds to an approximate 1 00-meter

increase or decrease in cloud height.

(5) Extract the operator cloud height. Using the example in step 3,

the operator cloud height would be 780. The operator would report

the observer cloud height as "operator cloud height 780 meters,

over."

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9-26

d. Engagement Footprint. The ground surface area in which the

round can successfully maneuver is limited. The optimal limit of

engagement of the Copperhead round is called a footprint. The

outer boundary of the footprint represents 50 percent of the hit

probability, whereas the center of the footprint has a probability

substantially higher than 50 percent. Footprints are roughly oval in

shape and form around the target location sent in by the operator.

Although a round can maneuver to the outside limits of the

footprint, the greatest chance of hitting the target is when it is at or

near the target location sent to the FDC. The greater the target

location error, the lower the probability that the round will hit the

target. The size and shape of the footprint are affected by the type

of trajectoty flown by the round, the target cloud height, and the

gun-target range. Knowing the limits of the Copperhead

maneuverability (footprint), the observer can determine which

target to la:se within the footprint boundary while the projectile still

has time to maneuver.

e. Copperhead Footprint Template. The operator can use a

Copperhead footprint template to map out or visualize the

Copperhead footprint. (See figure 9-8 on page 9-27.) The template

consists of a cover card and 13 template cards. The cover card

contains an operator cloud height table on one side and minimum

cloud height information on the other. The template cards are clear

plastic graphical devices (1:50,000 scale). Each card has the shape

of the footprint partially cut into the card. Also, each card is

marked with the footprint letter code, the type of trajectory, the

gun-target range, the interval, the average TOF, a center line, a
target location pinhole, and an angle T scale. This information is

automatically provided in the digital MTO.

Figure 9-8. Example of Copperhead Footprint Template Card.

(1) Footprints A - D. Footprints A - D are ballistic-mode

footprints. The blue color code on these sets indicates that the

minimum target cloud height requirement is 10 percent of the

actual gun-target range.

9-27

Footprint Letter Code

Gun-Target Range nteral

Footprint

Target Location

Pinhole

Angle I Scale
9-28

(2) Footprints E - I. Footprints E - I are glide-mode footprints.

The blue color code indicates that the minimum cloud height

requirement is 600 meters. The green color code indicates a

750-meter minimum target cloud height, and the black color code

indicates a 900-meter minimum. Footprints F and H show two

footprints. The smaller (blue) footprint is for a target cloud height

of 600 meters. The larger (green) footprint is for a target cloud

height of 750 meters or greater. For target cloud heights between

600 and 750 meters, the operator should draw both footprints and

visually interpolate the size of the footprint between these two

target cloud heights.

(3) Footprint L. Footprint L is a high-angle footprint. The red

color code indicates a minimum cloud height requirement of 2,120

meters.

f. Selecting and Orienting the Template Card. During target

planning, the operator selects the appropriate footprint on the basis

of the expected gun-target range and location of the battery with

which he habitually operates. For refinement, if the operator does

not have the required information to orient the footprint on

occupation of the OP, he should contact the battery FDC and

request the needed information or the MTO for the target.

(1) Orienting the Template. To orient the template card, the

pinhole appearing within the footprint is centered over the planned

target location. The center line is aligned with the OTL. Using the

OTL as an index, the angle T is set off to the right or left by using

the angle T scale at the bottom of the template card. The center line
should now be aligned with the GTL. If the operator does not have

the battery location or the angle T and guns left or right of his

location, he may request the Copperhead MTO from the FDC.

After the template card has been properly oriented, the footprint

can be drawn by inserting a pencil or other marking device into the

openings on the card. The drawing is completed by removing the

card and connecting the broken lines.

(2) Visualizing the Footprint. The operator can use the MULE to

help him visualize the footprints on the ground. Once the operator

has drawn the footprints on his map, he selects several points

around the edges of the footprints and determines the direction and

distance to them. He then locates these points on the ground by

using the MULE. By visually connecting the points, the operator

can determine the shape of the footprints on the ground. The ability

of the operator to visualize Copperhead footprints on existing

terrain is essential to effective Copperhead target planning. The

operator uses the Copperhead footprint template and his ability to

construct a visibility diagram for the areas of likely enemy activity

to help him in fire planning.

(3) Estimation. Visualizing the Copperhead footprint is as

important to the successful engagement of targets of opportunity as

it is for planned targets. However, visualizing targets of

opportunity is more difficult because of the lack of time to draw a

footprint on the map. Instead, the operator estimates the

dimensions of the footprint in the general vicinity of the target of

opportunity. If planned target footprints have not been established,

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9-30

the operator selects an average footprint based on the gun-target

range or TOF and visualizes it on the ground.

(4) Target Mobility. Although static targets such as command

posts are not a concern, vehicles, when attacked or lased, will

attempt to maneuver out of the Copperhead engagement area. The

mobility of the vehicles, whether or not they have laser

countermeasures, the terrain, and other factors (obstacles, etc.) will

affect the amount of time and the number of targets that will be

available within the desired Copperhead engagement area. Trigger

selection criteria also depend on target mobility and are discussed

below.

9011. Copperhead Call for Fire. The following call for fire

formats are used for Copperheads. Priority planned targets provide

the greatest responsiveness from the FDC, followed by planned

targets and, last of all, targets of opportunity. The FDC must have

the observer's PRF code, as well as visibility and cloud height of

the target area, to determine accurate firing data. This information

should be reported regularly, as when reporting position.

Copperhead missions, like conventional missions, can be fired on

either planned targets or targets of opportunity.

a. Planned Targets. Planned targets are either priority targets or

on-call targets with firing data already computed. Because of its

relatively short response time, the Copperhead planned target is the

preferred method for employing Copperheads.
(1) Number of Rounds. The criteria for determining the number

of rounds include the planned number of targets (to a maximum of

six rounds), Copperhead footprint size, target mobility, and the

longevity of the laser designator. Unless otherwise requested, the

FDC plans two rounds per Copperhead target. The second round is

prepared as "do not load" and available by requesting "repeat." The

number of rounds fired may vary from the planned request

depending on the situation. Based on target mobility, the number

of rounds does not have to equal the number of target elements. If

the target is expected to remain in the engagement area, the

observer may request one or more rounds to be fired sequentially.

(2) Planned Target Call for Fire. The observer requests

"Copperhead" in the target's initial call for fire or target list

worksheet. When a target is detected and is predicted to move

within one of the preplanned footprints, the observer calls for fire

on his predetermined aim point. The observer may request up to

six rounds to be fired at intervals (30 seconds unless otherwise

specified). On notification from the FDC, the observer lases the

first element until the round impacts. If the FO obtains a kill, he

realigns the MULE on another target and lases the next round.

When longer firing intervals are employed (e.g., 30 seconds or

more), the observer should not continually designate while

acquiring the next target. If a target is missed, it can be

redesignated for the next round. (See figure 9-9 on page 9-32.)

b. Targets of Opportunity. When planned target locations are not

available, the operator engages the target as a target of

opportunity.Calls for fire for Copperhead targets of opportunity

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9-32

follow the same format as the standard call for fire. Normally, the

observer uses "at my command" or "by round at my command."

rA5s this is A71, fire target AY 4751, over."

"Three tanks, three rounds, at my command, over."

or

"This is A71, fire target AY 4781, over."

Figure 9-9. Copperhead Calls for Fire on Planned Target.

Example

"A57 this is A71, fire for effect, laser polar, over."

"Direction 1800, distance 3450, vertical angle plus five, over."

Two tanks, Copperhead, two rounds, by round at my command, over."

If a moving target is detected outside a preplanned footprint but is

within engagement range, the observer uses the MULE to estimate

its speed and direction and predicts an intercept point. The

intercept point is reported to the FDC by using polar plot data from

the MULE (preferred), shifting from the target or a known point, or

using grid coordinates. At my command is the recommended

method of control when attacking moving targets of opportunity.

When requested, the battery fires the Copperhead rounds at

intervals of 30 seconds after the operator gives the command to fire

the first round. When by round at my command is requested, the

operator controls the firing of each round.
9012. Message to Observer. After the call for fire is received by

the FDC and the mission processing is started, the MTO is sent.

For single-element targets with one round planned and one round

"do not load," the number of rounds is announced as one. The

elements of the Copperhead MTO, in addition to normal elements,

include the PRF code, angle T, gun-target range, TOF, and

howitzer right or left of OT line. This allows for template

orientation. When planning targets, this information will not be

available until both battery and observer are in position.

Example

QUEBEC, three rounds, code 241 angIe T 400, range 7000, TOF 25, right

of OT line, over."

9013. Trigger Points. To ensure that a moving target and a

Copperhead round arrive at the planned target locationlintercept

point at the same time, the operator determines a trigger point. (See

figure 9-10 on page 9-34.) A trigger point is a point on the ground

at which the operator will command the battery to fire when the

target passes over or near it.

In choosing a trigger point, the operator must consider the intended

path of the target, the target speed, the Copperhead TOF, the

transmission time, and the size and shape of the footprint. His first

step is to determine the distance from the planned target

location/intercept point to the trigger point. This is done by adding

the transmission time (an average of five seconds) to the TOF

received in the MTO. Multiplying this sum by the speed of the

target gives the distance to the trigger point.

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9-34

After acquiring the target, the operator follows it until he is sure of

the direction in which it is moving. As the target moves, the

operator can use one of two methods to determine its speed. First,

he can estimate the speed as "slow" (three meters per second/seven

miles per hour), "medium" (five meters per second/i 1 miles per

hour), or "fast" (eight meters per secondll8 miles per hour).

Second, he can use the MULE to measure the distance that the

target moves during a certain time interval. As the target moves,

the operator lases it and converts the polar data to grid locations.

By using the two locations, he determines how far the target has

moved. He divides this number by the time interval between those

Area in Which

Target Is First

Acquired

Trigger Point

Planned Target Location

Trigger Point Offset

Distance TOF x

Target Speed

Figure 9-10. Trigger Point for Planned Target.
locations to determine the target's speed (in meters per second) and

the direction in which it is moving.

Example

Transmission time = 5 sec

TOF = 25 sec

Target speed = 5 rn/sec

(5 sec + 25 sec) x 5 rn/sec = 150 m (distance from trigger point to target)

The trigger point is determined by setting off the distance to the

trigger point from the planned target locationlintercept point along

the intended path of the target.

With a planned target, the target may not travel over the initial

planned target location. Therefore, the operator should select his

trigger point so that the target will be as near as possible to the

planned target location when the Copperhead round arrives.

If the target passes the trigger point before the battery reports

"ready" but is still within the footprint when "ready" is received,

assess the situation. The footprint represents a 50-percent

probability of a hit. Determine how far the target will travel out of

the footprint should the operator fire the round immediately. (See

figure 9-11 on page 9-3 6.)

If the target has passed through the footprint before the battery

reports "ready" or will have by the time the round arrives, the

operator should make a bold shift to a new target location. Data for

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9-36

the new target location should be sent to the FDC immediately.

When the operator does not intend to request "by round at my

command," the trigger point becomes the point at which he

initiates his call for fire. Therefore, mission reaction time must be

included when determining the distance to the trigger point.

Normal mission reaction times are as follows:

• Priority targets—30 seconds plus TOF

• On-call targets—90 to 120 seconds plus TOF

• Targets of opportunity—i 80 seconds plus TOF.

Figure 9-11. Trigger Points for Target Not in Center of

Footprint.
9014. Copperhead Engagement Commands

a. Shot. As soon as the first Copperhead round is fired in a

mission, the operator receives "shot" from the FDC. If he specified

"at my command" or omitted the method of control in the call for

fire (battery fires when ready), he receives "shot" only once. The

subsequent rounds will be fired at intervals of 30 seconds without

notification (the exact interval will be set by unit SOP). If the

operator specified "by round, at my command," he receives "shot"

for each round fired. If an operator fails to acknowledge "shot" for

a given round, it will not be retransmitted because the operator's

timing will be affected.

b. Designate. The next and most critical engagement command is

"designate." When the operator receives the command "designate"

from the FDC, he begins designating the target with the MULE.

The command is sent 20 seconds before impact. If the TOF is 20

seconds or less, "shot" and "designate" are sent in the same

transmission. "Laser on" is used for voice transmissions.

(1) The operator must designate the target during the last 13

seconds of the TOF. Once the operator has received "shot," he

should begin his own countdown by using the TOF received in the

MTO. If for some reason he has not received a "designate"

message, he should begin designation when 13 seconds are left in

his countdown.

(2) If the battery is firing the Copperhead rounds automatically at

30-second intervals, the command "designate" is sent only for the

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9-38

first round. The operator either continues designating for the

subsequent round or, if designating for more than two rounds,

releases the trigger while moving the laser spot to the next target.

(3) If "shot" is given for each round or if the firing interval is

greater than 30 seconds, "designate" is given for each round.

c. Designate Now. If an operator fails to acknowledge the

"designate" command, the command "designate now" is sent by

the FDC until the operator acknowledges or until the TOF of the

round elapses. If the operator fails to acknowledge the "designate

now" command, "shot" and "designate" are sent on the next round

fired, regardless of the method of control.

d. Rounds Complete. The FDC reports "rounds complete" after

the engagement commands for the last round are transmitted and

acknowledged. If the operator wants to terminate firing before the

last round is fired and the FDC is controlling the firing of

subsequent rounds, he sends either "cease loading" or "check

firing, cancel check firing, end of mission." If the operator is

controlling the firing of subsequent rounds, he sends "cease

loading" then "end of mission" to terminate the mission.

e. Requests for Additional Rounds. If additional rounds are

required to engage the target array, the operator may request them

in one of two ways. For single-round missions, the observer simply

requests "repeat" for the remaining round in "do not load" status

or, after the last Copperhead round is fired, he may send,

"(number) rounds repeat."
9015. Survey Control. If elements of survey (grid location,

direction, and altitude) are not available, laser designators and

rangefinders can be used in conjunction with the digital message

system or BCS to provide the observer, or other observers, with

accurate grid location and direction. The same procedures can be

used during position improvement to improve firing accuracy and

to extend accuracy into the target area. The most important factor

in considering the accuracy of observer location and direction is

the source. The ideal source for all survey is the supporting

artillery battalion (common survey). The following self-location

procedures are predominantly based on using known points or the

observer's own directional control. If a known point is a burst or is

located by map spot or if direction is obtained by compass, errors

exist and will be passed on to the observer's grid and direction.

Always use the most accurate means available to obtain survey

control.

a. MULE North-Finding Module. The MULE's north-finding

module provides the ability to locate true north andlor grid north

with an accuracy of ±2 mils. The north-finding module is also

capable of calculating grid convergence when location has been

entered. The north-finding module has a 6,400-mi! capability and

can find north in less than two minutes from positions of up to 66.5

degrees latitude and in less than four minutes from positions

between 66.5 degrees and 75 degrees latitude. The north-finding

module will store the location even with the power off and has a

built-in test for the electronics and display. For further information

and procedures for the north-finding module and the MULE, see

TM 08579A-12/l, Operators Manual for AN/PAQ-3 MULE.

9-39
9-40

b. Self-Location. The procedures for self-location use different

elements of survey to orient the observer. Self-location can also be

employed during position improvement to improve firing accuracy.

Once established, these accuracies can be passed to other observers

in the area cf operations. The different procedures have different

requirements and provide different elements of survey. Either a

digital message system or BCS can perform all computations.

Likewise, a BC scope with a laser rangefinder can be used to

perform the same procedures as a MIJLE without a north-finding

module.

(1) Trilateration. Trilateration requires the distances and vertical

angles to two known points. The known points should be at least

300 mils apart and accurately located. Trilateration provides grid

location and direction to the observer. It can be performed with a

MULE or laser rangeçinder. The observer locates himself by

determining accurate distances to two known points. The observer

can report these distances to the FDC or enter them into his digital

message system, which, in turn, computes his location. The

observer always specifies the point on his left (lase and announce

first). (See figure 9-12 on page 9-41.)

(2) Resection. Resection requires the direction, distance, and

vertical angle to one known point. A back azimuth is determined

from the polar information to provide a grid location to the

observer. Because he is using only one point, the observer must

have accurate directional control and common survey with the

FDC for the known point, if desired. If not, these errors will be

translated into location error. (See figure 9-13 on page 9-42.)
Observer: "A16 this is A23, perform tritateration, known points one and

two."

FDC: (Reads back.)

Observer: "Known point two on left: distance 3180, vertical angle +10.

Known point one: distance 1230, vertical angle -10."

FOC: (Reads back.)

FDC: "Grid 45867 32339, altitude 422. Direction to known point two:

3,095 mits."

Observer: (Reads back.)

Figure 9-12. Self-Location by Using Trilateration.

(3) Triangulation. Triangulation requires directions to two known

points (known points should be at least 300 mils apart) and

provides a grid location without the altitude. If vertical angle is

included in the data, the determined altitude must be verified (at

least by map spot). It can be performed by a BC scope. In this

procedure, the observer sends the directions and vertical angles

(optional) for two known points to the FDC or enters them into his

digital message system. The FDC determines the observer location

and provides an altitude. (See figure 9-14 on page 9-43.)

c. Self-Location by. Using One Known Point and One Burst. If

only one known point is available, the second prearranged point

may be established by a planned burst of an HE or WP round. The

natural dispersion in terms of probable errors in range and

deflection for the projectile will transfer survey errors to the

observer's location. The operator should plan the location of the

burst so that it is separated from the known point by at least 300

9-41
9-42

mils. Graze bursts should be used. By using the MULE, the

operator ranges the known point and the burst to determine the

required direction, distance, or vertical angle for each of the two

points. He reports these to the FDC or enters them into his digital

message system. The FDC computes the MULE location and

corrected azimuth to the known point and sends the information to

the operator. The accuracy of the computed MULE location and

reference azimuth are affected by the accuracy of the firing data

and must include accurate altitude to the burst point. The FDC

should use the most accurate data available. Known Point I

/

/ DirecDon 1328 Oistan 3020 /

Vertical AngIe *12 /

/

/

Operator (Observer)

Figure 9-13. Se$f-Location by Using Resection.

d. Second-Observer Assistance. An observer who has been

accurately located and oriented through survey or through

self-location can help other observers to locate themselves. This

second MULE operator can establish known points for another

operator to use in self-location or can perform a simultaneous
observation with the other MULE operator on two illumination

rounds. FDC(s) can refer observers requiring self-location to

observers with survey control to coordinate assistance. Known Known Point 1 Point 2 /

Direction 1470 /

/ /

/ / Direction 2082 / // /

/ /

Operator (Observer)

Figure 9-14. Self-Location by Using Triangulation.

e. Establishing Known Points for Other Operators. There will

be times when an operator emplacing a MULE or BCscope will

have no preestablished known points and no readily identifiable

terrain feature that can be measured from a map. A second operator

with an accurately located and oriented MULE can use it to

establish known points for the other operator. To do this, both

operators must be able to see a common area well enough to

identify and locate objects to serve as known points for

self-location. These points should be separated from each other by

at least 300 mils as observed from the observer position being

9-43
9-44

located. Once mutually agreeable points have been identified, they

can be established as known points as outlined below.

Example

An observer (A23) has no survey control or known points in his area. The

FDC (A16) instructs a nearby observer with a MULE (A47) that is accurately

located and oriented to assist in establishing known points in his area.

Mutually agreeable points have been identified.

FDC: A47 this is A16, establish known points for A23, over."

Observer: "Known point four tower at grid 45627 78953, direction 0832,

distance 5740, vertical angle minus nine. Known point five burned tank at

grid 45752 74452, direction 0947, distance 6370, vertical angle minus 11,

over."

With two known points established, the observer can now locate himself by

using self-location techniques. Any error in the oriented observer's survey

will be transferred to the obtaining observer's survey.

f. Location by Simultaneous Observation. An operator with an

accurately located and oriented MULE can help to determine the

location of another observer by performing a simultaneous

observation on two illumination rounds with that observer. (See

figure 9-15 on page 9-45.) The accuracy of survey obtained by the

observer is based on the accuracy of the contributing observer's

survey. This technique is especially useful during periods of

limited visibility (darkness). Both operators must be able to see

and lase the illumination rounds. Also, these illumination rounds

should be separated by at least 300 mils as seen by the observer

position being located. Thorough prior coordination between the
two operators must take place for effective use of this technique.

The observer of the accurately located MULE acts as the

controlling station and initiates the illumination call for fire as

outlined in the example.

Figure 9-15. Locating Second Observation Point by

Simultaneous Observation.

9-45

IIIu,mnaton Rounds

1 •

Sknuftaneou$ Ohae.vabon Second Round

, I Obsereabo4l ,

Plot Round A

,/ Than / 300nnle \ I

Surveyed OP OP Location "AUnknown
9-46

Example

A47 is the operator of the accurately located MULE. A23 is the operator of

the MULE being located. A16 is the battery FDC. Coordination between A47

and A23 has already taken place.

"A16 this is A47, simultaneous observation with A23, over."

"One round, grid 391 516, one round, grid 374 522, over."

"Illumination, by round at my command, over."

"A47 this is A23, ready to observe, over."

"A47 this is A16, ready, over."

"A16 this is A47, fire, over."

As the illumination round descends, the operator with the accurately located

MULE coordinates simultaneous lasing on the flare. He begins tracking the

descending flare and has his radio operator transmit "tracking, tracking,

tracking . . . lase." Once the command "lase" is given, both operators

lase/range the flare's parachute simultaneously, record the data, then repeat

the process with the second illumination round. The operators must use their

judgment to determine whether they have received an accurate return from

the flares parachute. If one of the operators feels that he has an inaccurate

return, the tracking phase should be immediately repeated before any data is

sent to the FOC. The controlling observer sends his data to the FDC either

as polar data or a converted grid. The FDC establishes the data as grid

locations. The obtaining observer then sends his data to the FDC by using

one of the self-location techniques. He can also use a digital message

system once he has been provided With the grid locations from the

controlling observer's data.

"A16 this is A47, point one, direction 6377, distance 4120, vertical angle plus

23, over."

"Point two, direction 6205, distance 2090, vertical angle plus 45, over."

"A16 this is A23, conduct triangulation, points one and two, over."

"Point one, direction 4095, point two, direction 4835, over."

"A23 this is A16, location 3751 4832, over."

(continued)
g. Directional Control. If the obtaining observer does not have

directional control, he can still perform the procedure by

trilateration. He must establish a reference point before the

procedure and record the number of mils indicated on his device to

that point. When conducting the simultaneous observation, he must

record the number of mils to the left-most illumination round at the

time of lasing. When the FDC provides direction to the left-most

illumination point, he compares the two numbers, obtains a

correction factor, applies it to his reference point, and reorients his

observation device.

Example

Observer reference point: direction 2010

Observer direction to left-most illumination point: direction 4095

FDC direction to left-most illumination point: direction 4090 FDC direction

minus observer direction: 4090-4095 = -5 (correction factor) Correction factor

applied to reference point: 2010 + (-5) = 2005 Mule or BC scope

reorientation to reference point: direction 2005

h. Observer Actions After Being Located. As soon as the

operator knows his accurate location, he should record his location

on the map and, if provided with direction, adjust the azimuth to

his reference point as described in the procedures above. He should

then determine polar plot data to several prominent points around

his position for future use. (See figure 9-16 on page 9-48.) The

digital message system or BCS can determine the grids to these

points for the operator, and they can be established as known

points. The MULE can also assist the observer in preparing a

visibility diagram by ranging objects along selected azimuths.

9-47
9-48

Defilade areas can then be marked on the map. Once the observer's

position is known to the FDC and he has accurate directional

control, the observer can fire for effect on targets from his location.

This assumes that the firing-unit FDC is firing accurately.

9016. Laser Polar Missions. An accurately located and properly

oriented MULE, or oriented BC scope with laser rangefinder, has

accurate enough target location for the first-round fire-for-effect

missions. However, some of the requirements for accurate

Figure 9-16. Using a Laser To Determine Known Points and

New Location.
first-round fire for effect may be lacking at the battery. If the

operator is not sure that he can achieve first-round fire for effect on

the target, he should adjust fire by using laser poiar data. If the

MULE is correctly oriented, then it gives him the capability to fire

for effect on the subsequent round. The laser polar adjust-fire

mission is processed differently from other missions.

a. Fire Direction Center-Computed Shift. The operator sends the

laser polar plot data of the burst (equivalent to a spotting) to the

FDC, which computes the shift (equivalent to a correction) and,

normally, fires for effect. The observer's data is transmitted as

direction, distance, and vertical angle or is converted to grid

coordinates. If the burst dissipates before it can be lased, the

observer transmits "lost burst" to the FDC.

Example

Burst direction 5872, distance 4350, vertical angle minus 11, fire for effect,

over."

b. Observer-Computed Shift. If the supporting FDC is not

automated, then the operator can compute his own subsequent

correction or have the FDC process it manually. (See table 9-3 on

page 9-50.)

9-49
9-50

Table 9-3. Calculation of Shift by Observer.

Procedure Example

Compute the operator-burst (OR)

distance factor. Express to the nearest

1,000 meters.

OB distance 3,480

OB factor 3

Determine the deviation shift. Multiply

the angular deviation by the OB factor.

25 x 3 = 75 (left 80)

Determine the range shift (OT range -

OB range). Express to the nearest ten

meters.

Distance to target 3,680

Distance to burst -

Difference 200

Compute a vertical shift (if it exceeds 30

meters). Determine the vertical angle

difference between the burst and the

target, then multiply by the OB factor.

Express to the nearest ten meters.

Vertical angle to target +2

Vertical angle to burst (-) j•

Vertical angle difference +3

3 x 3 = 9 m (10 m)

. Note: The observer's correction would be left 80, add 200, fire for effect,

over."

Example

'H24 this is H58, new target, direction 0220, distance 3680, vertical angle

plus two, over."

"Battalion assembly area, 1CM in effect, over."

9017. Target Shifts. Laser poiar missions have the capability to

conduct large shifts much like an NGF fresh target. If a new target

is located, or a shift from an auxiliary adjusting point is employed,

the observer prevents the FDC from applying the new location as a

correction to the previous round by announcing "new target." If
this is not announced, the FDC will apply the difference between

the previous burst and new location in the opposite direction.

9018. Registrations with MULEs. The MULE may be used to

accurately determine data for HB, MPI, or precision registrations.

When the accuracy of the operator's location meets the standards

for an HB or MPI registration, the HB/MPI is the preferred method

of conducting a registration. If the location or direction for the

MULE is doubtful, it may still be used to help conduct a precision

registration. Use of a MULE in conducting registrations does not

lessen the number of fired rounds required for the FDO to achieve

assurance of validity.

a. High-BurstJMean Point of Impact Registration. The FDC

either requests that the observer lase an orienting point or provides

the operator with orienting data through an MTO. The operator

uses the MULE to determine laser polar plot data for the burst of

each round fired during the registration and sends the data to the

FDC. If operating with a digital message system, the observer

should convert the polar data to grid. Before conducting an HB

registration, the operator should ensure that safety restrictions do

not prevent lasing the burst if it is above the skyline.

b. Precision Registration. In a precision registration, the operator

uses the MULE to determine accurate burst locations and transmits

them to the FDC for subsequent corrections. The observer is still

responsible for controlling the phases and number of rounds and

for recording registration points. During the time phase, the

9-51
9-52

observer uses the MULE to spot all bursts but determines and

transmits subsequent corrections and refinements.

c. Abbreviated Registration. In an abbreviated registration, the

registration is conducted with less than the optimal number of

rounds. The operator Iases the burst of the first adjusting round as

outlined for adjusting fire by using the MULE. The FDC computes

new firing data and fires a second adjusting round. The operator

lases the burst of the second round as well. This process is

continued until the lased burst is within 50 meters of the

designated registration point. If a time portion has also been

requested, two air bursts are fired to establish the mean HOB. The

operator sends corrections to adjust the mean H013 to 20 meters.

Example

"A23 this is Al 6, message to observer, abbreviated registration, known point

quick and time, over."

"A16 this is A23, direction 6216, over." (First adjusting round is fired.)

'Direction 6327, distance 3140, vertical angle minus 11, over." (Second

adjusting round is fired.)

"Left 30, add 50, record as registration point, time repeat, over." (One

HE/time round is fired.)

"Down 25, two rounds, repeat, over." (Two time rounds are fired. Note that an

air burst must be achieved.)

"Up five, record as time registration point, end of mission, over."

9019. MULE Employment by the Naval Gunfire Spot Team.

The spot team in each SFCP is equipped with a MULE. However,

there are no laser-guided munitions presently available for NSFS

ships. The spot teams employ their MULEs for purposes of range

finding, target location, and self-location.
9020. AN/GVS-5 Laser Rangefinder Employment. The

AN/GVS-5 is a lightweight, handheld laser rangefinder that can

determine the range of a target quickly and accurately. The device

emits a laser burst and detects its return when the burst is reflected

from a distant object. The time lapse between the emission of the

beam and its return is converted to meters and displayed in the

eyepiece on the range-to-target display. When accurately aimed,

the AN/GVS-5 provides a range that is accurate to within 10

meters of the target. However, clutter in front of or behind the

target may cause false readings in the ANIGVS-5. To ensure

accurate data, the observer should associate the displayed range

with a terrain-map analysis and his own range estimate to decide

whether the reading is accurate. When, in the observer's opinion,

all of these figures do not correlate, he should consider the

following.

a. Multiple Firings. Three consistent readings generally indicate

that the observer has aimed in the same place each time.

b. Minimum Range Set. Although the emitted laser beam is

relatively narrow, it is wide enough to reflect from more than one

target or object. The AN/GVS-5 is equipped with a multiple target

warning light inside the eyepiece that illuminates when more than

one return signal is received. When multiple target readings are

indicated, the range displayed is the range to the first object from

which the beam is reflected.

(1) To prevent false readings from an intermediate object between

the observer and the target, the AN/GVS-5 is equipped with a

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9-54

minimum range set. Ranges to the nearest 10 meters and up to

5,000 meters may be set on the minimum range set. The range set

indicates the range within which the AN/GVS-5 will not register a

return. This option eliminates receiving false readings from

intermediate objects.

(2) The observer adjusts the minimum range set by correlating the

range displayed and his own range estimate based on map and

terrain analysis. On the minimum range set, the observer can save

time by establishing the maximum range beyond which he is

certain the target lies before he begins ranging a target. On

completion of a mission, the minimum range set should always be

set back to zero.

c. Adjustment of Fire. Lateral and vertical shifts in the adjustment

of fire are computed by using the mu relation in the same way as

for adjustment of fire using binoculars. Range adjustments are

made by using the difference in range between the target and the

burst and making the correction in the appropriate direction.

d. Target Location. The distance provided by the AN/GVS-5

should always be used with the most accurate available direction to

the target and a quick, but thorough, map analysis. The observer

should remember that the AN/GVS-5 is designed to help him

refine distances. Therefore, the distances determined by the device

should always be correlated with known information before target

location is produced.
Appendix A

Target Analysis and Munitions Effects

1. Observer Responsibilities. As the eyes of indirect-fire

supporting arms, artillery FOs, mortar FOs, and NGF spotters must

properly describe the target to the firing unit. Additionally, FOs

must recommend and NGF spotters must decide on the best

method of attack based on the size, type, and posture of the target.

2. Target Analysis. A target must be analyzed to determine its

weak points. The decision as to where the target is most vulnerable

and what fires will best exploit its weaknesses is influenced by the

degree of damage desired. On the basis of the commander's

guidance, the observer must determine the degree of effects

needed. In analyzing a target, the observer should consider the

following. (See tables A-i and A-2 on pages A-2 through A-4.)

3. Effects Sought. In analyzing the target, the observer must

consider the effects sought. The three categories of target effects

sought are suppression, neutralization, and destruction.

a. Suppression. Suppression of a target limits the ability of enemy

personnel to perform their mission. This type of fire is used against

likely, suspected, or inaccurately located enemy units where time is

essential. It can be delivered by small delivery units. Various

munitions can be used to cause suppressive results, such as HE or

A-I
A-2

smoke. The effect of suppressive fires lasts only as long as the

duration of fires and does not damage the target.

Table A-I. Target Characteristics and Considerations.

Target Characteristics Considerations

Composition Indicates achievable destructive or incendiary effects.

Size and shape May require special sheaf, multiple aim points.

Vulnerability Affects weapon selection.

Mobility May affect weapon/ammunition selection because of

required response time.

Resiliency May affect decision to engage.

Location May affect weapon selection because of proximity to

friendly forces; accuracy will affect volume of fire to

achieve desired effects.

Table A-2. Environmental Characteristics and

Considerations.

Environmental

Characteristics Considerations

Weather Restncts/prohibits use of some weapons/munitions. For

example, clouds and fog may affect the use of lasers and

some aircraft/ordnance.

Wind affects attacking targets with smoke, 1CM, FASCAM,

or illumination projectiles.
Terrain Rugged terrain reduces vulnerability of targets and

increases volume of fire for desired effects.

Overhead vegetation reduces effectiveness of some

munitions and requires delay fuze action.

Orientation of terrain features in the target area may

________________

require repositioning of firing units or high-angle fires.

Urbanized areas 1CM and HEIVT should be reserved for firing at personnel

on rooftops and targets in the open.

High-angle fires should be employed for targets in

defilade.

HE/Q or concrete piercing (CP) is effective for rubbling and

covered targets.

HE/delay is not effective for mortar or brick penetration.

(Use HE/Q or CP.)

Are conducive to illumination and incendiary munitions.

Allow use of FASCAM to close routes.

Mountainous Require high-angle fires to attack defilade targets.

areas

Increase lethality of HE in hard, rocky surfaces.

Reduce effectiveness of WP, 1CM, and FASCAM in deep

snow and wooded areas.

Make unobserved fires less accurate in changing

atmospheric conditions.

A-3
A-4

Enhance air bursts on reverse slopes.

Allow use of FASCAM to compartmentalize or close

routes.

Are conducive to rock slides.

Offer opportunity for CAS to attack targets on reverse

slopes and steep slopes.

Jungle areas

Desert areas

Reduce effects of most munitions because of vegetation.

Restrict employment of bomblet submunitions (1CM,

CBUs) because of overhead cover.

Promote fires in proximity to friendly forces.

Reduce effectiveness of unobserved fires due to target

dispersion.

Increase use of smoke for screening; however,

atmospheric conditions reduce duration of smoke screens.

Arctic areas Slow rates of fire.

Cause 1CM, FASCAM, and HE/Q to be less effective

because of deep snow and mud.

Allow the best results for air bursts.

Reduce smoke effectiveness.

Cause resupply of ammunition expenditure to be

controlled because of difficulty of resupply.

b. Neutralization. Neutralization of a target, in addition to

suppressing it, knocks the target out of the battle temporarily.
Personnel casualties or weapons systems damages of 10 percent or

more are considered to neutralize a unit. A damaged weapons

system has significantly degraded performance until repairs are

made. Examples include a firepower kill, such as a destroyed main

sight or gun, or a mobility kill from a damaged engine or tread.

The unit or target can become effective again when the casualties

are replaced and the damage is repaired. The assets required to

neutralize a target vary according to the type and size of the target

and the weapon/ammunition combination used.

c. Destruction. Destruction requires a target to be completely

reconstituted or replaced. It is defined differently for units and

individual weapons systems. In terms of units, it is a larger amount

of casualties or damage. Casualties or system damages of 30

percent (as defined in mobility, firepower, and crew-kill

neutralization) inflicted during a short time span are considered to

render a unit destroyed. Destruction of an individual weapons

system occurs when it suffers both a firepower and mobility kill, a

crew kill, or a catastrophic kill. With precision destruction

missions, direct hits are used to destroy hard materiel targets.

4. Ammunition and Its Effects. This paragraph discusses

ammunition for indirect-fire weapons. (Ammunition for CAS is

discussed in chapter 4.)

a. Projectiles

(1) High Explosive. The HE projectile is a hollow shell filled with

trinitrotoluene (TNT) or Composition B. When detonated by a PD,

A-5
A-6

delay, VT, or mechanical time fuze, bursts cause fragmentation and

blast over a wide area. It is most often used by the observer in

adjustment. Shell HE is effective against personnel, vehicles, and

material. HE/VT from artillery and NGF is also effective against

stationary armored vehicles. Shell HE is fired by mortars, artillery,

and NGF.

(2) White Phosphorus. The WP shell is a burster-chemical-type

projectile. Its hollow shell bursts on impact by an internal charge

that expels burning WP over a limited area. This shell is used for

marking, screening, obscuring, and incendiary effects. It is used

against vehicles; petroleum, oils, and lubricants (POL) and

ammunition storage areas; and enemy observers. The V/P shell is

most commonly fired with an impact fuze. However, it may be

fired with ftize time to obtain an air burst. It cannot be fired with

faze VT. The WP shell can be fired by mortars, artillery, and NGF.

(3) Illumination. This is a base-ejecting-type projectile. A canister

containing burning illuminant is ignited and expelled in a small

parachute. This projectile is used for battlespace illumination or

marking. Illumination can be fired by mortars, artillery, and NGF.

(4) Hexachloroethane Smoke. Shell smoke is a base-ejection

projectile that is filled with canisters that emit smoke. The smoke

projectile is more effective than WP in screening because it has

less of a tendency to pillar. This projectile can be fired from all

artillery weapons except the eight-inch howitzer.
(5) Felt-Wedge Smoke. The HC smoke projectile has been

replaced with the M825 improved smoke round. The M825 is a

base-ejection projectile that uses felt wedges impregnated with WP

to create uniform dispersion of smoke over an area. The M825

provides 5 to 10 minutes of smoke over a large area. Unburned

wedges can cause a hazard to friendly forces; therefore, caution

must be exercised when operating in these areas. The M825 is

delivered by 1 55-mm artillery weapons.

(6) Family of Scatterable Mines. FASCAM artillery shells are

used to deliver antipersonnel (ADAM) or antitank mines

(RAAMS) against an enemy force. The FASCAM shells are

delivered by 1 55-mm artillery weapons.

(7) Copperhead. The Copperhead is a cannon-launched guided

projectile. It consists of a 14.5-pound shaped charge that is capable

of penetrating most armor and destroying point targets. (See

chapter 9.)

(8) Improved Conventional Munitions. The 1CM shell is a

base-ejection projectile that consists of a mechanical time fuze and

a body assembly containing grenades. When the fuze functions, the

grenades are dispersed over a large area. There are two types of

1CM: dual purpose and antipersonnel. APICM is no longer in

production. The DPICM is produced in two artillery munitions,

M483A1, called 1CM, and M864, called base burn 1CM. It is very

effective against exposed troops and vehicles. It is also effective

against armored vehicles. 1CM projectiles can be fired by artillery

and rocket systems.

A-7
A-8

(9) High Capacity. The high-capacity projectile is a fragmenting

round that can also produce penetration effects. The projectile may

have multiple fuzes, including a nose fuze. The fuzes are a nose

plug; a PD or mechanical time fuze; an auxiliary detonating fuze,

which is an intermediate detonating device to magnify the

explosion of the nose fuze; and a base detonating fuze with a delay

arming action. The high-capacity projectile is fired by the five-inch

naval gun.

b. Fuzes. See figure A-i on page A-9 for examples of fuze actions.

(1) Fuze Quick. Fuze quick is a PD fuze that functions on impact.

It is fired from all indirect-fire weapons (artillery, mortars, NGF)

with the HE projectile (most commonly in adjustment) or WP

projectile. Faze quick loses its effect if troops are in trenches, on

uneven ground, or on earthworks. It is used against personnel who

are standing, personnel who are prone on the ground, armored

vehicles, and light material.

(2) Faze Delay. A fuze delay is a 0.05-second delay that can be set

on the quick faze to allow either ricochet fire or penetration. The

observer should use fuze delay for penetration if he wants to fire

into dense woods or against light earthworks or nonmasonry

buildings. Faze delay is not effective against concrete or brick (use

CP or quick). Fuze delay can be used in conjunction with a

ricochet. A ricochet causes a low air burst when there is a small

angle of impact on a hard surface. Ricochets are particularly

common when firing high charges in artillery or when firing NGF.
Figure A-I. Fuze Actions.

(3) Mechanical Time Fuzes. The time fuze functions in the air at a

given time along the trajectory. It requires adjustment to achieve

the proper 20-meter HOB when used with HE or WP. Therefore,

another shell/fuze combination should be considered if time is

critical and air bursts are desired. Fuze time should never be used

A-9

Fuze Time or VT
A-b

for high-angle missions. Time fuzes are used with HE and WP

against troops in the open, in trenches, or in fighting holes;

vehicles; and materiel. It can be fired by all artillery weapons and

NGF. Time fazes are also used for payload munitions such as

illumination, smoke, M825 smoke, and 1CM projectiles.

(4) Proximity Variable Time Fuzes. Proximity VT fuzes are

radio activated for detonation at a seven-meter HOB. A VT fuze

provides a more effective air burst than fuze time and does not

have to be adjusted. It is an excellent fuze to fire with shell HE for

fire-for-effect missions, unobserved fires, or high-angle fires. It

should be used in missions conducted by an aerial observer when

an air burst is desired. It is used against all targets that can be

attacked with fuze time. Fuze VT can be fired with HE projectiles

by all artillery weapons, mortars, and the five-inch naval gun.

Various proximity fuzes exist in the NGF inventory.

(5) Controlled Variable Time. CVT ftizes have an adjustable

arming feature that prevents the fuze from arming until the set time

has elapsed. Therefore, it provides more safety when firing over

friendly troops. The CVT faze is available for NGF HE projectiles.

It is the preferred proximity fuze for NGF.

(6) Other Variable Time Fuzes. Other versions of the VT fuze

exist in the NGF inventory, for example, variable time-radio

frequency (VT-RF) and variable time-infrared (VT-IR).

(7) Concrete-Piercing Fuze. CP fuzes are used with artillery and

NGF HE projectiles for attack of concrete structures or earth- and
log-reinforced emplacements. The two types of CP fuzes are

nondelay and delay. Nondelay is used primarily for spotting or for

clearing rubble and shattering concrete. Delay is used to destroy

the concrete target.

Table A-3 provides a guide for selecting weapons to attack various

targets.

TableA-3. Guide for the Attack of Targets.

Target Weapon/Ordnance

Personnel:

In the open Mortar—HE/Q or VT

Artillery—HEIQ, VT, or time; DPICM

NGF—HE/Q, time, or VT

Air—general purpose, fuel air explosive, cluster,

firebombs, guns

In fighting holes Mortar—HEIVT

Artillery—H ENT or time

NGF—HEJVT or time

Air—fuel air explosive, general purpose, cluster

Under light cover Mortar—HE-delay

Artillery—HE-delay or HE/QNT mix

NGF—HE-delay

Air—general purpose, rockets, guns, cluster

Under heavy cover

(concrete bunkers)

Artillery—HE-CP, HE/Q, Copperhead

NGF—arrnor piercing or HE-delay

Air—general purpose, guided weapons

Armored vehicles: Mortar—HE/Q or VT

Artillery—HEJQ, VT, or time; DPICM; Copperhead

NGF—HE/Q or delay

Air—guided weapons, general purpose, rockets,

guns, cluster

A-Il
A-12

Field artillery: Artillery—DPICM, HE/VT, WP, FASCAM

NGF—HE/Q or VT, WP

Air—cluster, guided weapons, general-purpose

bombs

Antiaircraft artillery:

Automatic Mortar—HE/VT, WP

Artillery—DPICM, HENT, WP, smoke

NGF—HEJQ or VT, WP

Air—cluster, guided weapons, general-purpose

bombs, firebombs, guns

Self-propelled Same as armored vehicles

Missile launchers: Mortar—HE/VT

Artillery—DPICM, HE/VT

NGF—HE/Q or VT

Air—missiles, guided and cluster weapons, general

purpose, firebombs

Radar installations: Mortar—HE/Q or VT

Artillery—DPICM, HEJQ or VT

NGF—HE/Q or VT

Air—missiles, guided/cluster weapons, general

purpose, fuel air explosive, guns, rockets

Field fortifications: Mortar—HE-delay, WP

Artillery—HE-CP or delay, DP!CM, WP

NGF—HE-CP or delay, HE/Q, WP

Air—general purpose, guided bombs, rockets

Supply

depots/dumps:

Mortar—HE/VT, WP

Artillery—HE/VT or time, DPICM, WP

NGF—HE/VT or time, WP

Air—cluster, firebombs, general purpose, guided

bombs, rockets

Land transportation:

Roads Mortar—HE-delay

Artillery—HE-delay or CP, FASCAM

NGF—HE-delay or CP

Air—general-purpose bombs
Trucks Mortar—HEIQ or VT, WP

Artillery—HE/Q or VT, DPICM, WP

NGF—HE/Q or VT, WP

Air—guided missiles and cluster weapons, general

purpose, guns, rockets

Buildings: Mortar—HE-delay, HE/Q or VT, WP

Artillery—HE-CP or delay, HE/Q, WP

NGF—HE-CP or delay, HE/Q, WP

Air—guided bombs and missiles, general purpose

(reverse blank)

A-13

Appendix B

Crater Analysis

1. General. Whenever and wherever hostile cannon, missile, or

mortar shelling is detected, it must be reported without delay to the

appropriate S-2. The S-2 can then evaluate and act on such

information. When counterfire agencies are provided with

sufficient information, they can implement immediate operational

objectives to ensure the successful attack of hostile weapons.

Observers and liaison personnel should be capable of conducting

crater analysis.

Shelling reports (SHELREPs) form the basis for effective

counterfire action. The most reliable, accurate, and informative

SHELREPs are visual or electronic observation supplemented by

crater analysis and fragment identification.

2. Procedures for Crater Analysis. The observer can determine

the direction of fire of an enemy projectile with reasonable

accuracy by analyzing its crater or ricochet furrow. The observer

can obtain weapon location by plotting the intersection of the

back-azimuth rays from two or more widely separated craters

caused by projectiles fired from the same weapon. Essentially,

crater analysis involves determining the axis of the crater, marking

the axis, and measuring the azimuth of the axis to the weapon.

B-I
B-2

The initial step in crater analysis is to locate a suitable crater for

use in determining the direction to the hostile weapon. The crater

should be clearly defined on the ground and should be reasonably

fresh.

Because the crater is the beginning point for plotting direction to

the enemy weapon, the observer should determine grid coordinates

of the crater as precisely as the time and the method used will

allow. The observer must collect shell fragments to identify the

type and caliber of the weapon. The observer must determine

direction to the firing weapon by using one of the methods

described below.

3. Artillery Shell Craters

a. Faze Quick Craters. The detonation of a projectile causes an

inner crater. The burst and momentum of the shell carry the effect

forward and to the sides, forming an arrow that points to the rear

(toward the weapon from which the round was fired). The fuze

continues along the line of flight, creating a fuze furrow (groove in

the ground). There are two methods of obtaining a direction to a

hostile weapon from this type of crater. The observer can obtain

the best results by determining a mean or average of several

directions from both methods.

(1) Faze Tunnel and Center of Crater Method. In this method,

one stake is placed in the center of the crater and another is placed

in the furrow at the point where the fuze was blown forward to the

front of the crater. (See figure B-i on page B-3.) A
direction-measuring instrument is set up in line with the two

stakes, and the direction is measured to the hostile weapon. There

are five steps of the fuze tunnel and center of crater method:

Figure B-I. Fuze Tunnel and Center of Crater Method.

• Step one—Place a stake in the center of the crater.

• Step two—Place a second stake in the fuze furrow.

• Step three—Set up a direction-measuring instrument (i.e.,

compass, aiming circle) in line with the stakes and away from

fragments.

B-3

Oirection-Measunng

Instrument

To Gun
B-4

• Step four—Orient the instrument.

• Step five—Measure the direction to the hostile weapon.

(2) Variation of the Fuze Tunnel and Center of Crater Method.

A variation of this method is to place a stake where the shell

entered the ground instead of in the center of the crater and

determine the direction in the same manner. However, this is rarely

possible because indications of the point of entry are usually

destroyed by the explosion of the shell.

(3) Side Spray Method. The side spray method involves bisecting

the angle formed by the lines of the side spray by striking arcs.

(See figure B-2.) The seven steps in measuring the direction of a

fuze quick crater by the side spray method are as follows:

Figure B-2. Side Spray Method.

InstnUn,t

Side Sp.ay.

Stake
• Step one—Place a stake in the center of the crater.

• Step two—Place two stakes, one at the end of each line of side

spray, equidistant from the center stake.

• Step three—Hold a length of WD-1 wire to each side-spray

stake, and strike an arc forward of the fuze furrow.

• Step four—Place a stake where these arcs intersect.

• Step five—Set up a direction-measuring instrument in line with

the stake at the intersection of the arcs and the center stake.

• Step six—Orient the instrument.

• Step seven—Measure the direction to the firing weapon.

b. Fuze Delay Craters. There are two types of fuze delay

craters—ricochet and mine action.

(1) Ricochet. The projectile enters the ground in a line following

the trajectory and continues in a straight line for a few feet, causing

a ricochet furrow. The projectile normally deflects upward and at

the same time changes direction. The change in direction usually is

to the right as a result of the spin or rotation of the projectile. The

effect of the air burst can be noted on the ground. (See figure B-3

on page B-6.) Directions obtained from ricochet craters are

considered to be most reliable. The five steps in determining

direction from a ricochet furrow are as follows:

• Step one—Clean out the furrow.

B-5
• Step two—Place stakes at each end of a usable straight section

of the furrow.

• Step three—Set up an instrument in line with the stakes and

away from the fragments.

Step four—Orient the instrument.

Step five—Measure the direction to the weapon.

Figure B-3. Ricochet Furrow Method.

(2) Mine Action. Mine action occurs when a shell bursts beneath

the ground. Occasionally, such a burst will leave a furrow that can

be analyzed in the same manner as the ricochet furrow. A mine

action crater that does not have a furrow cannot be used to

determine the direction to the weapon.

4. Mortar Shell Craters. In a typical mortar crater, the turf at the

forward edge (the direction away from the hostile mortar) is

B-6

Shell Cuts Through Grass Stake Set Here

lnstment Furrow

To Gun

Effect of

Air Burst
undercut (cut beneath with a portion left overhanging). The rear

edge of the crater is rid of vegetation and grooved with splinters.

(See figure B-4.) When fresh, the crater is covered with loose earth

that must be carefully removed to disclose the burnt inner crater.

The ground surrounding the crater is streaked by splinter grooves

that radiate from the point of detonation. The ends of the splinter

grooves on the rearward side are on an approximately straight line.

This line is perpendicular to the line of flight when on level ground

or on slopes with contours perpendicular to the plane of fire. (See

figure B-5 on page B-8.) A fuze tunnel is caused by the fuze

burying itself at the bottom of the crater in front of the point of

detonation. Three methods may be used to determine direction from

a mortar shell crater—main axis, splinter groove, and fuze tunnel.

B-7

Figure B-4. Main Axis Method.
B-8

a. Main Axis Method. There are four steps used in determining

direction by the main axis method when a definite and regular

crater is formed:

• Step one—Lay a stake along the main axis of the crater,

dividing the crater into symmetrical halves. The stake points in

the direction of the mortar.

• Step two—Set up an instrument in line with the stake and away

from fragments.

Step three—Orient the instrument.

Step four—Measure the direction to the weapon.

b. Splinter Groove Method. The five steps in determining

direction by the splinter groove method are as follows:

Instrument

Figure B-5. Splinter Groove Method.
• Step one—Lay a stake along the ends of the splinter grooves

that extend from the crater.

• Step two—Lay a second stake perpendicular to the first stake

through the axis of the fuze tunnel.

• Step three—Set up an instrument in line with the second stake

and away from fragments.

• Step four—Orient the instrument.

• Step five—Measure the direction to the weapon.

c. Fuze Tunnel Method. The four steps in determining direction

by the fuze tunnel method are as follows (see figure B-6 on page

B-1O):

• Step one—Place a stake in the faze tunnel.

• Step two—Set up an instrument in line with the stake and away

from fragments.

• Step three—Orient the instrument.

• Step four—Measure the direction to the weapon.

B-9
B-I 0

5. Rocket Craters. A crater resulting from a rocket impacting with

a low or medium angle of fall is analyzed in the same manner as an

artillery crater resulting from a projectile armed with fuze quick.

However, if the rocket impacts with a high angle of fall, the crater

is analyzed in the same manner as a crater resulting from a mortar

round. The tail fins, rocket motor, body, and other parts of the

rocket may be used to determine caliber and type of rocket fired.

Instrument

Top tflew

Side Wew

Figure B-6. Fuze Tunnel Method.
6. Shell Fragment Analysis. The type and caliber of a hostile

weapon can be determined by analysis of shell fragments.

Dimensions of the parts, as well as of the complete shell, vary

according to the caliber and type of shell. (See figure B-7 on page

B-12.) The fragments must contain one or more features that can

be matched with technical specifications of the shell. Such features

are mortar fin assemblies, rotating bands, and fuze wells. Also, the

curvature and thickness of large shell fragments can aid in

identification. The observer should make sure that the data on

munitions suspected to be in the area are disseminated through

intelligence channels. Fragments from hostile shells that cannot be

identified should be tagged and sent to the S-2 concerned. To be of

maximum value, the tag for the fragment should show the

following:

• The date and time at which the shell impacted

• The accurate location of the crater

• The direction from which the shell came and the method used in

determining this direction (survey of crater, sound, flash, etc.)

• The name and organization of the person reporting

• A reference to a previously submitted SHELREP, if appropriate.

B-Il
Adapter -

Bourrelet

Body

Band

Groove

Boattail

B-I 2

Exterior Walt

Section Diameter —+ Thickness Length

Nose I

Base

Rotating Band

'((("L+G I () I

Imprint _____________ ____________ Impnnt of Land of Groove

Figure B-7. Typical Shell Showing Critical Measurements.
a. Duds and Low-Order Bursts. Logically, a dud would provide

the best identification of the caliber of a weapon. However,

because a dud may not always be available (or, if available, may be

too dangerous to handle), a low-order burst would provide the next

best means of identification. When the explosive filler is

incompletely detonated, a low-order burst occurs and large shell

fragments result. The observer can use these large pieces to

identify thread count, curvature, wall thickness, and so on.

b. High-Order Bursts. A high-order burst will normally form into

small, deformed fragments. These fragments are useless for

identification purposes unless they include a section of either the

rotating band or the rotating band seat. Fragments of either of

these sections positively identify the shell because each shell has

its own distinctive rotating markings. (See figure B-8 on page

B-14.)

c. Rotating Bands and Band Seats. The observer may identify a

shell as to caliber, type, and nation or other place of origin from the

following:

• Pattern or rifling imprints

• Width, number, and size of rotating bands

• Dimensions and pattern of keying or knurling (ridges) on the

band seat

• Dimensions and pattern of keying and knurling impressed on

the rotating bands.

B-I3
B-I 4

155-mn, Howitzer, HE

M.102 17-18 ScI,nieder

155-mm Gun. HE

Figure B-8. Shell Fragment Identification, U.S. Ammunition.

518 in 13/16 in

3 5/64 in
d. Tail Fins. The observer may identify a mortar from the mortar

shell fragments and tail fins; the latter is the best indication of the

type and caliber. (See figure B-9 on page B-16.) A mortar that is

not fin stabilized may be identified from pieces of the projectile on

which rifling is imprinted. Tail fins are often found in the fuze hole

of the crater.

Note

With the exception of rotating bands and band seats on the tail fins, different

types of shells may be identical in one dimension, such as wall thickness, but

seldom will be alike in two or more dimensions. Therefore, it is possible to

make positive identification from two or more dimensions.

e. Fuzes. Because the same type of fuze may be used with several

types of projectiles, it is impossible to establish the type and

caliber of a weapon by examination of the fuze.

f. Other Common Artillery and Mortar Rounds. Some other

common artillery and mortar rounds are shown in figures B-b

through B-13 on pages B-17 through B-19.

7. Determination of Caliber by Geometric Analysis of

Fragments. The geometric method of determining projectile

caliber is based on the problem of circumscribing a circle about a

triangle. For accurate results, the following considerations apply:

B-I5
B-I 6

Ro1dng Angie of 14 Band Seat BooSa Thread Count (14) ,__

rJUULWL 155-mm Howttzer. -nt Figure B-9. Shell Fragment and Tail Fin Identification, U.S.

Ammunition.

105-mn, Hondtar. IS
Figure B-1O. 122-mm-Gun Projectile.

Figure B-lI. 85-mm Projectile.

B-I 7

I

1.18 in I

4.

•4

.±. ________ ;-

_*.n [[E[([([[CL[[[[[[[[[[C[[[[
B-I 8

Figure B-12. 82-mm Mortar Round, 5 Fins.

16.in Oiameter
I

1

I•A?4

Figure B-13. 152-mm Projectile.

• The fragment selected for use should be the largest available. It

should include an arc of the projectile circumference ranging in

size from a minimum of one-half inch for a small-caliber

weapon (37 mm) to a minimum of two inches for a large-caliber

weapon (10 in).

• The fragment must be from that portion of the projectile located

between the rotating band and the bourrelet. In the case of a

nonboat tail (square base) projectile, the fragment may be from

any portion located between the bourrelet and the base.

• The fragment should not be distorted. 1-lowever, if the fragment

is only slightly distorted, the results will be fairly accurate and

will give a close approximation of the caliber.

The approximate caliber of a suitable fragment that meets the

above conditions can be determined by using the following

procedures (see figure B-14 on page B-20):

B-I 9
Point of

Intersection ______________________________

Dashed Line Is

Perpendicular

I Bisector of

Line

Ill IV

Figure B-14. Determination of Projectile Caliber by Geometric

Analysis of a Fragment.

B-20

Fragment

(Top View)

)nt

+ +

Point Point

A B

Line To Be

Bisected

Bisector i Bisector

of Une of Line . IA B Point

Point Point B

A Point

I' of Intersection

of the Two

Bisectors
• Select two points (in this case, A and B as illustrated in the "I"

portion of the figure), and place them as far apart as possible on

the circumference of the projectile fragment.

• Measure the chord (straight line segment) distance between

points A and B with dividers or any other suitable instrument,

and plot this measurement on paper (I and II).

• Select a third point C, on the arc fixed by A and B, and measure

the distance from point A to point C. Using this distance as the

radius, strike an arc about point A on the paper (II).

• Measure the distance on the fragment from point B to point C.

Using this distance as the radius, strike an arc about point B on

the paper. Mark the intersection of the two arcs. This is the plot

of point C.

• Draw a triangle, using points A, B, and C as the vertexes. Erect

perpendicular bisectors to the sides of the triangle (IV). To

construct a perpendicular bisector of a line, set off a radius

greater than one-half the length of the line. Using this radius,

strike arcs (one on each side of the line) from each end of the

line and draw a line connecting the two points of intersection of

the arcs. This line is the perpendicular bisector (III).

• Measure the distance from the point of intersection of the

perpendicular bisectors to one of the vertexes of the triangle,

and multiply this distance by two. The result is the diameter of

the projectile that produced the fragment.

B-21
B-22

8. Shelling Reports. A SHELREP is "any report of enemy shelling

containing information on caliber, direction, time, density, and area

shelled." (Joint Pub 1-02) The information obtained from a crater

should be forwarded by the most rapid means available. The

information is transmitted by using the standard SHELREP, which

corresponds to lines a through k of the form depicted in figure

B-15 (Department of the Army (DA) Form 2185-R, Artillery

Counterfire Information Form (ACIF)). Regardless of how little

information has been obtained, do not hesitate to forward the

information. Fragmentary or incomplete information is often of

value in supplementing or confirming existing information.

Items a, b, and k—unit of origin, position of the observer, and

friendly damage incurred-.--—are encoded for security reasons. The

current call sign or code name for the unit is in item a, and codes

used to transmit the information are included in items b and k. Item

b is not applicable when this form is used for crater analysis.

Because three elements—direction, dimensions, and

curvature—must be measured for crater analysis, the following

equipment is required:

• Measuring instrument—an aiming circle or compass

• Dividers and a ruler

• Curvature template—used to measure the curvature of the

fragment and so determine the caliber of the shell (See figure

B- 15 on page B-23.) (The template can be constructed of heavy

cardboard, acetate, wood, or other appropriate material.)
• Ammunition data sheets on commonly encountered munitions.

Figure 8-15. Artillery Counterfire Information Form.

(reverse blank)

8-23

Appendix C

Observation Post

An OP is "a position from which military observations are made,

or fire directed and adjusted, and which possesses appropriate

communications; may be airborne." (Joint Pub 1-02) The selection

of an OP is critical to the ability of the observer or spotter to

effectively call for and adjust fire, as well as to his survivability.

This appendix will discuss considerations for the selection and

preparation of the OP.

1. Selection of Observation Posts. Above all, when the observer

selects an OP, the OP must permit observation of the area of

operation of the supported unit. The observer must coordinate the

selection of his OP with other observers' OPs and maneuver OPs

to prevent/minimize gaps or dead spaces. Visibility diagrams

should be constructed, as time permits. The following should he

taken into consideration when selecting OPs:

• The observer must make sure that the OP is not vulnerable. OPs

may be identified by aerial observers or in aerial photographs by

loose dirt, wire lines, paths and approaches to the position, and

communications (excessive radio traffic or detection of

antennas).

• The observer should select an OP that can accommodate the

establishment and maintenance of communications.

c-I
C-2

• When practical, the selection of the OP should facilitate the

adjustment of fire, for example, angle T.

• The OP can enhance survivability through concealment.

Concealment is practically the only protection available in the

early stages of occupation. As time permits, the observer should

improve the OP because the observer must be able to function

in the most violent of situations.

• The OP should have routes of entry and exit without arousing

the suspicion of the enemy. The edges of woods and villages

can be used as entries and exits.

• The observer can use elevated points for OPs, such as crests,

trees, and so on. The observer should avoid landmarks and

prominent terrain features because these are probably targeted.

When selecting an OP. the observer must consider the

characteristics of the forward slope versus those of the reverse

slope.

a. Forward Slope Position (Military Crest). The following

characteristics of forward slope position should be taken into

consideration:

• This position affords a better view of the front and flanks.

• Fires impacting on the topographical crest will not neutralize

the position.
• This position aids in concealment because the hillside provides

background.

• Occupation during daylight is difficult without risking

disclosure of the position.

• Radio communications may be difficult. It may be necessary to

remote antennas to the reverse slope.

• This position does not provide cover from direct fire.

b. Reverse Slope Position. The following characteristics of

reverse slope position should be taken into consideration:

• This position may be occupied in daylight.

• It allows greater freedom of movement.

• The position facilitates installation, maintenance, and

concealment of communications equipment.

• The position affords protection from direct fire.

• It often affords only a limited field of view to the front.

• This position causes the OP to be neutralized when enemy fire

is adjusted on the topographical crest.

2. Preparation of the Observation Post. The preparation and

improvement of the OP must allow sufficient space for the

observer/team and his equipment, for example, the MULE. If the

C-3
C-4

OP is on the ground, a trench usually is the first means of

protection. Later, the OP may be improved by emplacing a cover

of logs and earth. As time permits, the OP can be fortified with

sandbags. Care must be taken to conceal the work by using both

the natural cover afforded by the ground and camouflage. The

observer must remove the signs of fresh digging. Special

precautions must be taken to camouflage cover and openings.

Figures C-i through C-3 on pages C-5 through C-7 provide

illustrations of improved OPs.

3. Tactical Occupation of an Observation Post. When

conducting a deliberate occupation of an OP, the observer's

defensive posture will be relatively permanent and will allow the

use of many procedures that would normally be omitted during

offensive operations. Many of the procedures used below are time

intensive but are extremely valuable techniques that are only

possible during static operations, such as establishing a deliberate

OP. One technique that the observer may use is represented by the

acronym SLoCTOP, which stands for security, location,

communications, targeting, observation, and position

improvement.

a. Security. The following steps should be taken during the

security phase:

• Before occupying the OP, establish a security patrol around the

surrounding area.

• Ensure that the security patrol covers a 6,400-mil area with a

500-meter radius around the tentative OP location.
Line

Note: The

Observation

Post Must Be

Concealed.

Figure C-I. Observation Post with Cover.

C-5

6-inDiameter

Logs

B

4'

Plan (With Cover Removed)
C-6

• The security patrol should consist of one portion of the FO team

(task oriented), with the remainder of the team remaining in a

holding position to monitor radio nets.

• Scouts must ensure that they do not silhouette themselves

during the patrol. They should exercise camouflage and noise

and light discipline during all phases of the OP occupation.

b. Location. The following steps should be taken during the

location phase:

Camouftaged Removable

k-Ground Line9.

Several Yards Apart

4. But Close Enough for

Easy Communication

by Voice

4— Four to Five Feet

Depending on

Heightof Man

Fra Protection

Against Artillery

lime Fire

Figure C-2. Observation Post Using One-Man Fighting Holes.
Ground Line Camouflaged Removable Top

.

- -

.———--------

-- — — -..J1Td ...w

Figure C-3. Observation Post Using a Two-Man Fighting

Hole.

C-7

jJwJ. --

I Ii
C-8

• While the security patrol is being conducted, the FO should be

finalizing the exact observation site. Degree of accuracy for

self-location is 100 meters.

• The position should not be skylined or easily identifiable as an

OP (military crest, i.e., 2/3 up, on nondescript high ground).

• The location should offer sufficient observation into the enemy

operational area or likely enemy avenues of approach.

• The FO should prepare an OF fan for use, begin a terrain sketch

by using reference points that are easily identifiable, and

develop a visibility diagram in accordance with appendix E of

this publication.

• The FO should ensure that the current situation map is accurate

and contains all current friendly units, knownlsuspected enemy

positions, and graphical control measures.

c. Communications. The following steps should be taken during

the communications phase:

• Communication is the number one priority for the FO team.

Communications must be established with all required stations

during the security and location phases of SLoCTOP.

• Communication is the most valuable resource for developing

situational awareness during occupation. It is critical for the

radio/telephone operator (RTO) to record all information that is

transmitted (i.e., other missions, position updates, SALUTE
reports, etc.) to assist in the smooth transition from a mobile to

a static observation posture.

• If communications cannot be established or are distorted,

measures must be taken to establish/improve them (e.g., change

location, check batteries, improve antenna, etc.). Because of this

necessity, the FO should include procedures for field-expedient

antennas in his handbook.

• Ensure that higher headquarters (both maneuver and supporting

arms agencies) are updated with the most current observer

location and other relevant information, such as enemy

situation.

d. Targeting. The following steps should be taken during the

targeting phase:

• The FO should always locate targets by using the most accurate

and expedient means available. Furthermore, he should include

these target locations in his terrain sketch.

• Ensure that the MULE is well concealed and that both the

MULE and AN/GVS-5 are operated within safety parameters.

e. Observation. The following steps should be taken during the

observation phase:

• Ensure that all team members are proficient in friendly/enemy

forces recognition.

C-9
c-b

• The FO should constantly refine company targets and those

assigned by higher headquarters.

• The FO should identify trigger points and target reference

points (TRPs), review engagement criteria, and ensure that

information is understood by all team members.

• The FO should ensure that there is a well-implemented plan to

sustain 24-hour operations.

f. Position Improvement. The following steps should be taken

during the position improvement phase:

• As time permits, the P0 should dig in his position, including a

parapet. Through the use of foliage and items organic to the

area, he should ensure that there is a natural look to his position.

(A good technique to ensure that the position is concealed is by

viewing it from the enemy's point of view.)

• The FO should continually improve camouflaging (erect a net if

available).

• Units should have an SOP established for the conduct of an OP,

including a rotation schedule, placement of the head, and eating

procedures.

• Position improvement is continuous. Specific areas for

concentration are security, communications, noise and light

discipline, camouflage, and weapons and equipment

maintenance.
Appendix D

Timing the Delivery of Fire Support

An important aspect in requesting (and coordinating) fire support is

the ability to time the delivery of fires. The intent of this appendix

is to provide a description of each of the techniques to time the

delivery of fires that are used in Marine Corps operations. The

techniques are synchronization (PLGRlsynchronized clock),

elapsed time, and event. Other techniques and terminology for

timing the delivery of fire support (e.g., the running clock) should

be avoided because they are difficult to establish and often create

confusion.

1. Synchronization (Using the AN/PSN-11 PLGR).

Synchronization is a technique of placing all units on a common

time. The AN/PSN-1 1 PLGR is the preferable device for

synchronizing because it is the easiest and most accurate electronic

device available to establish common time. The PLGR must be

able to track at least one satellite. An unencrypted PLGR,

encrypted PLGR, and time cube will all display the exact same

time expressed in seconds.

2. Synchronization (Synchronized Clock). The synchronized

clock uses a specific hour/minute based on either local or the

universal (ZULU) time zone (as dictated by OPORD or unit SOP,

for example, "1505.") The synchronized clock requires all units to

be placed on an established time and requires periodic time checks.

D-1
D-2

Once established, the synchronized clock significantly streamlines

the coordination of timing. The synchronized clock is established

by the senior command element/headquarters and is disseminated

to all units. It is most easily disseminated electronically by

automated communications systems but can also be disseminated

from unit to unit by voice time checks or be acquired as needed

from the Naval Observatory. The voice transmissions for

establishing a synchronized clock are as follows.

Example

Sender: "T7Y (unit or collective call sign) this is V8P, stand by for time check

in two minutes, time will be 1505, over."

Receiver: "V8P this is T7Y, roger, out." (If collective call sign, each unit

responds.)

Sender: "T7Y this is V8P, stand by for time check.

five-four-three-two-one-hack, time is 1505, over."

Receiver: "V8P, this is 17Y, time 1505, out."

Note

Specify time zone if different from SOP/OPORD, for example, "time 1505

SIERRA."

a. Local Time. A local time zone (e.g., "ROMEOtime zone") may

be used to establish the synchronized clock. The use of the local

time zone on the synchronized clock may cause conñ.ision if the

unit or supporting forces (e.g., aircraft) are operating over more

than one time zone.
b. Universal Time. Universal time is based on the ZULU time

zone. Use of universal time facilitates timing of actions across time

zones and is the preferred basis for establishing a synchronized

clock. If required, units/agencies can independently access the

Naval Observatory, which provides an automated, continuous

broadcast of time. Units/agencies can acquire universal time from

the Naval Observatory on HF radio frequencies of 5.000, 10.000,

15.000, 20.000, or 25.000 MHz or by telephone at DSN

762-1401/1069 or commercial 202-762- 1401/1069. Universal time

is particularly advantageous when operations involve joint forces

andlor aircraft operating from remotely located airfields.

c. Definition of Universal Time. Universal time is "a measure of

time that conforms, within a close approximation, to the mean

diurnal rotation of the Earth and serves as the basis of civil

timekeeping. Universal Time (UT1) is determined from

observations of the stars, radio sources, and also from ranging

observations of the Moon and artificial Earth satellites. The scale

determined directly from such observations is designated Universal

Time Observed (UTO); it is slightly dependent on the place of

observation. When UTO is corrected for the shift in longitude of

the observing station caused by polar motion, the time scale UT1 is

obtained. When an accuracy better than one second is not required,

Universal Time can be used to mean Coordinated Universal Time

(UTC). Also called ZULU time. Formerly called Greenwich Mean

Time." (Joint Pub 1-02)

3. Elapsed Time. The delivery of fires may be timed by specifying

a number of minutes (and seconds as required) to elapse from a

0-3
D-4

stated countdown reference or "hack." Elapsed time is best used

when timing the delivery of fires in an immediate or time-critical

situation, when a synchronized clock has not been established, or

when a synchronized clock's accuracy is doubtful. Elapsed time is

difficult to disseminate when several units/agencies are involved,

for example, during a coordinated attack of a target by aircraft,

artillery, and NOF.

Elapsed time is expressed in relation to the transmission of "hack."

In starting an elapsed time, hack is always transmitted by

specifying the number of minutes and seconds to elapse before

ordnance is to impact on the target. The hack is used in

transmitting the TTT for immediate or on-call CAS.

Example

Eight (minutes understood) plus zero, zero (seconds understood). . hack."

The term "hack" is now used for all supporting arms and replaces

"mark" for use in initiating or establishing time.

4. Event. The timing of fires may be in relation to a specific event,

for example, H-hour or H-5. However, precautions should be taken

to ensure that all concerned agencies know the correct H- or

L-hour.
Appendix E

Construction of the Visibility Diagram

The observer constructs the visibility diagram in overlay form and

drawn to map scale. The completed visibility diagram is formed by

the systematic alignment of terrain profiles. A terrain profile is an

exaggerated view of a portion of the Earth's surface along a line

between two points, such as the line between the OP and point A in

figure E- 1. The observer can construct a terrain profile from any

contour-lined map.

Figure E-1. A Profile (Line OP-A) Constructed on a Contour

1. Step One—Drawing Radial Lines from the Observer's

Location. The observer does the following:

E-1

Map.
E-2

• Locates and plots his position on the map

• Constructs radial lines from the OP to the limits of his visibility.

Each adjacent pair of radial lines should form an angle of no

more than 100 mils. (See figure E-2.) Each radial line from the

OP represents a line of vision. The OF fan fulfills this function

when placed on the map and oriented.

Figure E-2. Radial Lines (Lines of Vision) Ranging Out From

the Observation Post.

2. Step Two—Constructing the Profile. The basic element of the

visibility diagram is a terrain profile. A terrain profile is an

exaggerated side view of a portion of the Earth's surface along a

line between two points. Each of the radial lines represents a

terrain profile, and each profile must be constructed. For example,

the most common way of indicating elevation and relief on maps is

op
by contour lines. A contour line is a line representing an imaginary

line on the ground along which all points are at the same elevation.

Starting at sea level, normally at zero contour, each contour line is

the contour interval, and the value of this interval is listed in the

marginal data on a map.

Starting at zero elevation, every fifth contour line is drawn so that

it is heavier than the other contour lines. These heavier lines are

index contours, and at some place along each index contour the

line is broken and the elevation listed. The contour lines falling

between index contours are called intermediate contours. The

observer can determine the elevation of any point by doing the

following:

• Determining the contour interval (from the map or marginal

data)

• Finding the numbered contour line nearest to the point for

which elevation is sought

• Determining the direction of slope from the numbered contour

line to the desired point

• Counting the number of contour lines that must be crossed to go

from the numbered line to the desired point and noting the

direction (up or down). The number of lines crossed multiplied

by the contour interval is the distance above or below the

starting value.

E-3

Draw a vertical line from each contour line intersecting the radial

line (profile line). Extend the vertical line to the (horizontal) line

corresponding to the elevation of a contour line. Continue this

procedure until all contour lines have been connected with their

corresponding elevations. The result will appear as a series of

perpendicular lines connecting points of a contour line with a

horizontal line of a specified elevation. After all vertical lines have

been dropped for contour lines, drop the vertical lines from

hilltops, ridgetops, stream lines, and valleys. (See broken lines in

figure E-4 on page E-6.) Then determine the end points of these

perpendicular lines by interpolation. If the diagram is being drawn

at the OP, make allowances for buildings, new construction, newly

grown vegetation, and other changes to the map.

The next step is to connect the end points of all perpendicular lines

with a smooth, curved line. When the points are connected, the

relief of the terrain along the profile line becomes apparent.

To determine visibility from the terrain profile, draw straight lines

from the OP to the lowest points of visibility along the entire

length of the terrain profile. Those areas that are not visible from

the OP are below the straight lines and may be shaded. (See figure

E-5 on page E-7.)

After the areas that are not visible from the OP have been

identified as in figure E-5, show them on the profile line. Do this

by extending perpendicular lines from the left and right limits of

the defilade areas as shown in figure E-5. The defilade is shown as

a heavy shaded portion of the profile line.

E-5
E.G

Figure E-4. Transferring Points from Profile to Profile Line.

3. Step Three—The Completed Visibility Diagram. After the

nonvisible areas have been transferred to the first profile line,

repeat the procedures described in step two for each profile line in

the zone of observation. (See figure E-6 on page E-7.)

As defilade areas along each line of vision are identified and

shaded, connect the nonvisible portions. (See figure E-7 on page

E-8.)

nfl
Figure E-5. Nonvisible Areas (Defilade).

Figure E-6. Nonvisible Areas on Profile Lines.

E-7

op
E-8

After adjacent profile lines have been analyzed and the areas that

are not visible have been revealed, the finished product appears as

shown in figure E-8 on page E-9. The observer highlights

nonvisible areas by shading or crosshatching the defilade areas.

The visibility diagram normally is completed in overlay form. As a

minimum, the marginal data listed in table E-1 should be placed on

the overlay. (See figure E-8 on page E-9.)

Table E-1. Marginal Data.

Item Example

OP grid 51382925

Primary azimuth of observation 0700 mils

Grid register marks Register marks

Map sheetlscale Podunk, 1:50,000

Map series/date V793, sheet 2345 UI, 1975

Name of observer 2dLt Cannon

Unit 3/10

Date-time group 251300 Feb

Left and right limits 200 mils, 1,200 mils

Figure E-7. Areas of Visibility and Nonvisibility.
S

Figure E-8. Completed Visibility Diagram Overlay With

Marginal Data.

E-9

(reverse blank)

50 33

Map: Podijtk 1:50000

Señes: V793, Sheet 2345 III 1975 2O0 t'

Appendix F

Weapons Reference Data

Table F-I. Naval Gunfire Platforms.

Hull Hull

Number Name Asmament GFCS Number Name Azmament GFCS

Cailfomia Class (CGN), 2 Ships

CGN 36 CalIfornia 2- MK-86 CGN 37 South Caidina 12- 5*/54 MK-86

flcondesvga Class (CC), 27 ShIps

CC 47

CG 48

CG 49

CG 50

CC 51

CG 52

CC 53

CG 54

CC 55

CG 56

CC 57

CC 58

CG 59

CG 60

Tiancieroga Yorkn

Vnnes

Valley Forge 11s S. Gates

Bunker Hill

Mobile Bay

Antletam

Leyte Gulf

Sai, Jadnto

Lake Champlain

Philippine Sea

Piincetln

Nornwidy

2-5154

2- 5154

2-5/54

2- 5754 2. 5/54

2- 5154

2-5*/54

2- 5'/54

2- 5/54

2- 5754

2-5*/54

2-5*/54

2-5*/54

2-5*/54

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

CG 61

CC 62

CG 63

CC 64

CC 65

CC 66

CG 67

CG 68

CC 69

CC 70

CC 71

CG 72

CC 73

Monterey

ChancelIorsiUe

Cowpens

Gettysburg

Chosln

Hue CIty

SliCh

Anzio

VrJsburg

Lake ErIe Cape St George

VeIla Gulf

Port Royal

2- 5/54

2- 5'/54

2-5/54

2- 5/54

2-5154

2- 5754

2- 5/54

2- 5/54

2-5*/54

2- 5/54

2-5*/54

2- 5/54

2-5*/54

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

Ar$elgh Burke Class (DOG), 23$hips Active, 8 Under Consthiction

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

DOG 51

DOG 52

DOG 53

DOG 54

DOG 55

DOG 56

DOG 57

DOG 58

DOG 59

DOG 60

DOG 61

OOG62

Meigh Burke

Bany

John Paul Jones

Curtis \Mlbur

Stout

John 5. Mctain

MIbioher

Laboon

Russet Paul Hamdton Rarnage

Fitgerald

1- 5/54

1-5*/54

1-5*154

1-5*154

1-5/54

1-5/54

1-5/54

1-5*154

1- 5/54

1-5*154

1-5*154

1-5/54

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK-34

MK.34

MK.34

MK-34

DOG 63

DOG 64

DOG 65

DOG 66

DOG 67

DOG 68

DOG 69

DOG 70 DOG 71 DOG 72

DOG 74

Stethem

Camey

Benfold

Gonzalez

Cole

The Suulvans

Millus

Hopper

Ross

Mahan

McFaul

1-5*154

1-5/54

1-5754

1-5/54

1-5154

1-5*154

1- 5/54

1-5*154

1- 5754

1-5*154

1-5/54

Kldd Class (DOG), 2 Ships

DOG 995 j Soot 12.5*154 MK-86 DOG 996 Chandler 12- 5/54 I

F-I
F-2

Spniance Class (DO), 27 Ships

DO 963

DD 964

DO 965

DD 966

DO 967

DO 968

DD 969

00970

00971

DO 972

DO 973

00975

DO 977

Spruarice

Paul F. Foster

Klnkaid

HeMtt

Elliot

Ard,urW Radford

Peterson

Coion

David ft Ray

Oldendorf

John Young

OBnen

Biise

2- 5754

2- 5754

2-5754

2-5754

2- 5754

2-5754

2-5754

2.5754

2-5754

2-5754

2-5754

2- 5754

2-5754

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-88

MK-86

MK-86

MK-86

MK-86

DD 978

DO 979

00980

DO 981

DO 982

DO 983

DO 985

00987

DO 988

OD 989

OD 990

00991

00992

DO 997

SturrV

Conoily

Moostxugger John HanaDdc NthoIson

John Rogers

Cushing

O'Bannon

Thom

Deyo

ingersoll

Fife

Fleer

Haler

2- 5754

2- 5754

2-5754

2-5754

2- 5754

2-5754

2-5754

2- 5/54

2-5754

2- 5754

2-5754

2- 5754

2-5754

2-5754

MK-86

MK-86

MK.86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

MK-86

Note: ve ships as of June1998.

Legend: CG = guided missile auiser DOG = guided missile desyer

CGN = guided missile auiser (nudest) GFCS = gunfire corteoi system

DO = desoyer
Table F-2. Characteristics of U.S. Mortars, Artillery, and

Rockets.

Caliber 60mm 81 mm 105

mm'

105

mm'

155mm 155mm' 227mm1 607mm'

Model M224 M252 M102 M119A1 M198 M109A5/

A6

MLRS ATACMS

Maximum

Range (m)

3,5002 5,6002 11,400 11,500 18,300

22,000k

18,200

21 ,700

32,000

45,0002

165,000

300,0002

Ammunition

HE,

WP,

ILLUM

HE,

WP,

RP,

ILLUM

HE, HC,

WP,

ILIUM,

APICM

HE, HG,

WP,

ILLUM,

APICM

HE, HG,

WP,

ILLUM,

APICM,

DPICM,

M825

smoke,

FASCAM,

Gopperhe

ad

HE, HG,

WP,

ILIUM,

APICM,

DPICM,

M825

smoke,

FASCAM,

Copperhea

d

DPICM APAM

Maximum

Rate of Fire

(Rounds!

mm)

30 35 10 10 4 4 12/40

sec

2/20sec

Sustained

Rateof Fire

(Rounds!

mm)

20 15 3 3 2 1 N/A N/A

Range of

RAP (m)

N/A N/A 15,300 19,500 30,100 30,000 N/A N/A

Range of

DPICM (m)

N/A

75

N/A 10,500 14,100 18,000

28,200

17,900

28,100

N/A N/A

Minimum

Range (m)

70 N/A N/A N/A N/A 10,000

13,000

25,000

70,000

Fuzes MO MO PD, VT,

MI,

MTSQ,

CP,

delay

PD, VT,

MT,

MTSQ,

CP,

delay

PD, VT,

MI,

MISQ,

delay

PD, VT,

MT,

MTSQ,

delay

ET ET

F-3
F-4

Illumination

Time (sec)

25 60 75 75 120 120 N/A N/A

HEBurst

'Mdth

(1 Round)

28 35 35 35 50 50 100 N/A

FPF 90

3tubes

35

ltube

210

6guns

210

6guns

300

6guns

3006guns

lSO3guns

N/A N/A

Notes: 1. U.S. Manne Corps units do not possess these weapons systems. However,

Mañne Corps units may operate with Amiy units equipped with these weapons.

2. WithM720 ammunition.

3. With M821 ammunition.

4. With M795 HE, M825 smoke ammunition.

5. Extended-range MLRS to be fielded in Fiscal Year 99.

6. Block 1A ATACMS to be fielded in Fiscal Year 98.

7. BBDPICM M864.

Legend: ATACMS = Aimy Taciical Missile System MT = mechanical time

ET = eleronic time MTSQ = mechanical time

HC = high capacity superquick

ILLUM = illumination RAP = rocket-assisted projectile

MO = multioption fuze, VT, PD, delay
Table F-3. U.S. Aircraft Capabilities Guide.

Type of

Aircraft

Communications

Package Navigation Guns

Conventional Ordnance

Laser Equipment

External

Maximum

Load Tracker Designator

AV-8B 2 UHF TACAN

INS

Rad&

25mm

300

rounds

Au 8,000 lb No No

Al-I-lW 2 UHF1 2VHFA!vl'

2 VHF-FM'

TACAN

ADF

FM homer

Radar beaccn

20mm

750

rounds or 20-nr,

pod

2.75-in

rodcets 5-in rockets TOW mssde

HELLFIRE

Seami

2500 lb No Yes

F/A-i 8NC6 2 UHF' 2 VHF-AM1 2 VHF-FM'

TACAN

ADF

INS

Radar

FUR

20mm

580

rounds

All 13,700 lb Yes

(pod)

Yes

F/A-i 80' 2 UHF'

2VHF-,AM'

2 VHF-FM'

TACAN

ADF

INS

Radar

FUR

20mm

515

rounds

All 13,500 lb Yes

(pod)

Yes

A-10 UHF

VHF-AM

VHF-FM

TACAN

INS

3Orm,

1,100

rounds

A8 16,000 lb Yes

(pod)

No

AH-64 UHF

VHF-AM

VHF-FM

TACAN

ADF

Doppler

30mm

1,200

rounds

70-mm

rocket

HELLFIRE

3,000 lb Yes Yes

F-16' UHF'

VHF-AM'

VHF-FM'

TACAN

ADF

INS

Radar

ILS

20mm

515

rounds

All 12,000 lb No Yes3

F-15E' UHF TACAN

ADF

INS

Radar

ILS

20mm

512

rounds

All 13,flolb No Ye&

F-5
F-6

Notes:

Can only niDto frequendes ata time.

2AV.8B "Ptus is equipped with radar lt has no laser spot tinder.

'F-16C/D and F-15E n designate if equipped with a LAN11RN pod.

4The AM-lW NightT System aiaft is GPS pable, and its FUR is gild/range-designation patse.

Some ainalt are GPS capabte.

Legend: ADF = au rr cdiren finder INS = inertiai navigation system

ILS instiument landing system TACAN = tadical ar navigation system

Table F-4. Naval Gunfire Weapons Systems.

Maximum Rate of Fire

Maximum Range(m) perTube

Range (m) Reduced (Madmum/

Weapon Full Charge RAP Charge Sustained) Ammunition Fuzes

5'?38 15,900 25,265 8,100 20115 HE, HC, ILIUM, Quidç MI,

WP, RAP CVT, VT

5''I54 23,100 29,181 12,200 20/20 HE, HC, ILLUM, Quick, MT,

WP, RAP CVT, VT,

delay
Table F-5. World Artillery, Mortars, and Rocket Launchers.

Rate of Fire

Manufacture,1

Weapon

Basic

Range (m)

Base

Buml

RAP

Range (m) Maximum Sustained

Counthes!

Oianbalions

Possessing Remarks

Austha

GHN-45, 1 55-mm ted 30,300 39,600 7/mm 2n Iran, Iraq,

Thstand

None

Brazil

AS1ROS II, MRL — 30,000

60,000

32/mn

4/nn

Reload

Reload

Saudi Arabia,

Iran, Qatar

None

China

S-1, 320-mi, MRL — 80,000 4/mn Reload None None

Type 83,273-mm MRL — 40,000 4/n'n Reload None None

Type 71, 180-mrnMRL — 20,000 10/mn Reload None None

WA 021,1 55-mm bed 30,000 39,000 5/n-in 2/mimi None None

Type 83,152-mm bved 30400 38,000 4miin 2/mimi Iraq None

Type 82/85,130-mm MRL — 15,000 60(5 n-sn Reload Thailand None

Type 59-1, 130-mm ed 27,500 38,000 10/rn-in 10/mn Iran. Iraq,

Oman, North

Korea, Egypt

Lebanon

None

France

GCT, 155-rn SP 23,000 29,000 6/mn 2/mn Iraq, Kuwait.

Saudi Arabia

None

OCT. 155-mm towed 24,000 32,000 3/18 sec 6/mn Cyprus None

MIcF3, 155-rn SP 20,000 25,000 3/mn 1/mn Iraq, Kuwait,

UAE

None

Genany

PzH 2000,1 55-mm SP 30,000 40,000 3/10 sec 9/mn None None

fran

Nb, 450-n-Tn MRL — 150,000 1/n-in 2/hr None None

Iraq

F-7
F-8

ARABEL 100. 400-mm

MRL — 100,000 4/nm Re'oad None None

ARABEL5O.262-mmMRL — 50,000 12k,n Re'oad Forr

Yugosiavia,

Bosnian Serb

Amy, Catia

None

845, 155-mm td 24,000 39,000 5/rrn 2/nmn None None

M71155.nnwed 23,500 30,000 5/mm 2Inn Singapore,

Thaiar, South

Athca

None

Paimesia, 155-nm SP 24,700 30,000 3/20 sec 4/nm Libya, Nigeria None

North Korea

M1985,240-n'mnMRL — 43,000 12krn Re4oad Iran CHEM

M1978, 170-mm, SP 40,000 — INA INA Iran, Iraq None

M48, 130-mm SP 27,500 — 6/mn 1.1/mn/n None None

BM 11, 122-mm, MRL — 20,500 3'mn Reload PLO, Syria, Iran,

Iraq, Uganda

None

M1981, 122-nynSP 23.900 — NA INA None None

Ml 992. 120-ron, SP rrrtar 8,700 — INA NA None None

Russla/CIS

FROG-7, MRL — 70,000 1/mn 1/nc FormerWarsaw

Pad.

Ngnsn,

Algeria. Cuba,

Egypt Iraq, North Korea. Libya, Syria,

Yemen

NUKE

CHEM

SMERCH, 300-mm MRL — 70,000 12/ni-i Reload Kuwait. UAE None

2S4, 240-mm SP nur 9,600 18,000 i/nm 40Thr Iraq, Czedi

Republic

NUKE,

LGM

P40, 240-mm towed

nutar

9,700 18,000 1/mn 38/nc IRA Iraq, North

Korea, Egypt

Omen, Leba

NUKE,

1GM

BM 27,220-mm MRL — 35,000 16/mn Reload Ahanisian,

Syria

CHEM. nmnes
2S7, 203—rn SP 37,500 47,000 2ftrn 2kri Czed, Republic,

Poland, Stovalcia

None

2S3, 180-mmtowed 30,400 43,800 lh'nin l/2rnn Inda Iraq,

Egypt Syria

None

2S3, 152-rn SP 20,600 24,000 4frrcin lmiin Hungary, Iraq,

Libya, Syria

None

2S19, 152-rn SP 24,700 30,000 8/rrn 8ftcn None LGM

2S5, 152-rn SP 28,400 37,000 5n SImm None None

2A36, 152.rntowed 28,400 37,000 5krin 1Mn Finland None

D.20, 152rm, towed 17,230 30,000 n 1/mm Algeria, China,

Cuba, Egypt

Vietham, Fm

Yigoslaia

None

BM 14, 1-rnMRL — 9,800 16/mn Retoad Algeria

Alghanatan,

Cambodia,

China. Egypt

Syria Nth

Korea, Vtham

CHEM

BM21, 140-rnMRL — 20,400 40/mn Reload China, Egypt

India, Iran, Iraq,

North Korea,

othera

CHEM,

mines

2S1, 1fl-mmn SP 15,300 22,000 8ñ*r 1.1/mn None None

D-30, 122-mm towed 15,300 22,000 8kTn 1.1/mn China None

2S9, 120-cm, SP mortar 8,900 13,000 6/rTn 6/nii Afghanistan LGM

2S23, 120-rn SP mortar 8,900 12,900 10/mn 10/mn None LGM

2B9, 82-cm, SP towed

mor

4,300 — 123/mn Hungary None

South Aca

G-6, 155-m'rrn SP 30,800 39,600 3/21 sec 4/mn UAE, On'ian None

G-5, 155-rn towed 30,200 39,000 3/mn 3/mn None None

UnIted Kingdom

FH 70,155-rn towed 24,700 31,500 3/13 sec 2/mn Germany, Italy,

Japan, Sa

Aabla

None

F-9
Former YugosIava

F-I 0

M-77, 128-rn MRL — 20,600 32kin Rebad Bosna Bosnian None

SerbMr, Cmaaj Sem

Monlaneo

Note: AnlelislIng of all arlilley systanai and thelr csazacenstics is avalable in the dassthed National

Govemrnt Intelligence Center (NGIC) senes FIe&iAntI?e,Y Refnce Defense Söence and

Tethnology (DS1) 11305-115-94, Cannon and i'vt DST I 130S-94 Vd. 2, Sup. 1; and NGIC 1143-2000-95,

%*e RodetLauncier Systems.

Legend: CHEM = themical munitions capable LGM laser-guidedrminitionscapable

CIS = Crionwealti of Independent MRL= rrsitiiplerodet launther

States NUKE = ni,dear munitions capable

NA = infom,ation not available PLO = Palestine Uberation Organization

IRA Irisli Republican Army SP = self- pitipeiled UAE = UntedAzabEn*ates
Appendix G

Glossary

Section I. Acronyms and Abbreviations

AAA antiaircraft artillery

AAV(P) assault amphibious vehicle (personnel variant)

ACA airspace coordination area

ACE aviation combat element

ACIF Artillery Counterf ire Information Form

ADA air defense artillery

ADAM area denial artillery munitions

ADF automatic direction finder

ALP Air Liaison Party

AM amplitude modulation

AOA amphibious objective area

APAM antipersonnellantimaterial

APICM antipersonnel 1CM

ARES angle rate bombing system

ASAP as soon as possible

ASC(A) assault support coordinator (airborne)

ATACMS Army Tactical Missile System

BBDPICM base burn DPICM

BC battery commander

BCS battery computer system

BDI-II bearing-distance heading indicator

BLT battalion landing team

BMNT beginning of morning nautical twilight

G-1
G-2

BUCS . backup computer system

CAS close air support

CBU cluster bomb unit

CEOI communications-electronics operating instructions

CG guided missile cruiser

CGN guided missile cruiser (nuclear)

CFIEM chemical munitions capable

CIS Commonwealth of Independent States

COF conduct of fire

concrete piercing

CVT füze controlled variable time

DA Department of the Army

DACT data automated communications terminal

DASC direct air support center

DD destroyer

DDG guided missile destroyer

DPICM dual-purpose 1CM

DST Defense Science and Technology

EENT end of evening nautical twilight

ET electronic time

ETA estimated time of arrival

FAC forward air controller

FAC(A) forward air controller (airborne)

FACP forward air control party

FASCAM family of scatterable mines

FDC fire direction center

FDO fire direction officer
FFAR folding-fin aircraft rocket

FFCC force fires coordination center

FLIR forward looking infrared

FM frequency modulation

FM U.S. Army field manual

FMFM Fleet Marine Force manual

FMFRP Fleet Marine Force reference publication

FO forward observer

FOM figure of merit

FPF final protective fire

FPL final protective line

FSA fire support area

FSCC fire support coordination center

FSCL fire support coordination line

FSS fire support station

GCE ground combat element

GFCS gunfire control system

GPS Global Positioning System

GTA Graphic Training Aid Gil gun-target line

GURF guns up ready to fire

FIB high burst

HC hexachloroethane

HC high capacity

HDC helicopter direction center

HE high explosives

HELLFIRE helicopterbome fire and forget missile

HE/Q HE/fuze quick

HF high frequency

G-3
G-4

HMMWV high mobility multipurpose wheeled vehicle

ROB height of burst

lADS Integrated Air Defense System

1CM improved conventional munitions

IFSAS Initial Fire Support Automation System

ILLUM illumination

ILS instrument landing system NA information not available

iNS inertial navigation system

IP initial point

IRA Irish Republican Army

JMEM Joint Munitions Effectiveness Manual

JTAR joint tactical airstrike request

KJA killed in action

LANTIRN low-altitude navigation and targeting infrared for night

LAR light armored reconnaissance

LARS left add, right subtract

LGM laser-guided munitions capable

LGW laser-guided weapon

LNO liaison officer

LTD/R laser target designator/ranger

MACCS Marine air command and control system

MAGTF Marine air-ground task force

MBC mortar ballistic computer

MCLOS manual command to line of sight

MCWP Marine Corps warfighting publication
MLRS Multiple Launch Rocket System

MO multioption fuze, VT, PD, delay

MOS military occupational specialty

MN mean point of impact

MRL multiple rocket launcher

MT mechanical time

MTL maneuver-target line

MTO message to observer

MTSQ mechanical time superquick

MULE modular universal laser equipment

NGF naval gunfire

NGIC ... National Government Intelligence Center

NGLO naval gunfire liaison officer

NLT no later than

NSFS naval surface fire support

NTS Night Targeting System

NUKE nuclear munitions capable

NVG night vision goggles

OAS offensive air support

OB operator-burst

OF observed fire

OP observation post

OPGEN MIKE operational message, general (maritime tactical

message), amphibious

OPORD operation order

OPTASK AMIPHIB operational tasking (maritime tactical

message), amphibious

OT observer-target

OTL observer-target line

G-5
G-6

PD . point detonating PDF principal direction of fire

PE probable error in range

PGM precision-guided munitions

PLGR precise lightweight GPS receiver

PLO Palestine Liberation Organization

PLRS Position Location Reporting System

POL petroleum, oils, and lubricants

POSREP position report

PPS precise positioning system

PRF pulse repetition frequency

QE quadrant elevation

RAAMS remote antiarmor mine system

RALS right add, left subtract

RAP rocket-assisted projectile

ROE rules of engagement

RP red phosphorus

RREMS . refinement, record as target, end of mission, and surveillance

RTO radio/telephone operator

SACC supporting arms coordination center

SACLOS semiautomatic command to line of sight

SALUTE size, activity, location, unit, time, and equipment

SAM surface-to-air missile

SEAD suppression of enemy air defenses

SFCP shore fire control party

SHELREP shelling report

S[NCGARS Single-channel Ground and Airbome Radio System

SITREP situation report
SLoCTOP . security, location, communications, targeting,

observation, and position improvement

SOP standing operating procedure

SP self-propelled

TAC(A) tactical air coordinator (airborne)

TACAN tactical air navigation system

TACC tactical air control center

TACP tactical air control party

TAD tactical air direction

TADC tactical air direction center

TAOC tactical air operations center

TAR tactical air request

TATC tactical air traffic control

TM technical manual

TNT trinitrotoluene

TOF time of flight

TOT time on target

TOW tube launched, optically tracked, wire command link guided

missile

TRAP tactical recovery of aircraft and personnel

TRP target reference point rrr time to target

UAE United Arab Emirates

UAV unmanned aerial vehicle

UI-IF ultrahigh frequency

UT1 universal time

UTC coordinated universal time

UTM universal transverse mercator

UTO universal time observed

G-7
G-8

VHF . very high frequency

VT fuze variable time

VT-IR variable time-infrared frequency

VT-RF variable time-radio frequency

WP white phosphorus

Section II. Definitions

A

add—In artilleiy and NGF support, a correction used by an

observer/spotter to indicate that an increase in range along a

spotting line is desired.

adjust fire—An order or request to initiate an adjustment of fire.

In artillery, a method of control transmitted in the warning order of

the call for fire to indicate that the observer will control the

adjustment. In NGF, the spotter uses the term "spotter adjust" as a

method of control to indicate his desire to control the adjustment.

adjusting point—The target itself or a point near the center of an

area target. Spottings are made from this point, and corrections are

made to this point.

adjustment—A process used in artillery and NGF to obtain

deviation (left/right), range (addldrop), and HOB (up/down)

corrections when engaging a target by observed fire.
air—In artillery and NGF, a spotting to indicate that a burst or

group of bursts occurred above the surface (i.e., in the air).

air burst—An explosion of a projectile above the surface as

distinguished from an explosion on contact with the surface or

after penetration of the surface.

altitude—The vertical distance of a level, a point or an object

considered as a point, measured from mean sea level. (Joint Pub

1-02)

B

battery commander scope—A telescope used by the observer to

enable him to remain in defilade while determining directions and

vertical angles in the target area.

battle damage assessment—The timely and accurate estimate of

damage resulting from the application of military force, either

lethal or non-lethal, against a predetermined objective. Battle

damage assessment can be applied to the employment of all types

of weapon systems (air, ground, naval, and special forces weapon

systems) throughout the range of military operations. Battle

damage assessment is primarily an intelligence responsibility with

required inputs and coordination from the operators. Battle damage

assessment is composed of physical damage assessment, functional

damage assessment, and target system assessment. (Joint Pub 1-02)

G-9
G-1O

bracketing—A method of adjusting fire in which a bracket is

established by obtaining an over and a short along the spotting line,

and then successively splitting the bracket in half until a target hit

or desired bracket is obtained. (Joint Pub 1-02)

C

close air support—Air action by fixed- and rotary-wing aircraft

against hostile targets which are in close proximity to friendly

forces and which require detailed integration of each air mission

with the fire and movement of those forces. (Joint Pub 1-02)

continuous fire—i. Fire conducted at a normal rate without

interruption for application of adjustment corrections or for other

causes. 2. In field artillery and naval gunfire support, loading and

firing at a specified rate or as rapidly as possible consistent with

accuracy within the prescribed rate of fire for the weapon. Firing

will continue until terminated by the command end of mission or

temporarily suspended by the command cease loading or check

firing. (Joint Pub 1-02)

continuous illumination fire—A type of fire in which

illuminating projectiles are fired at specified time intervals to

provide uninterrupted lighting on the target or specified area. (Joint

Pub 1-02)

coordinated illumination fire—A type of fire in which the firing

of illuminating and HE projectiles is coordinated to provide
illumination of the target and surrounding area only at the time

required for spotting and adjusting the HE fire.

correction—Any change in firing data to bring the MPI or burst

closer to the target. A communications procedure word to indicate

that an error in data has been announced and the corrected data will

follow.

D

danger close—Used by an observer/spotter in a call for fire to

indicate that friendly forces are within a prescribed distance from a

target or impact of rounds.

designate—A command given to lase a target for an LGW.

deviation—i. The distance by which a point of impact or burst

misses the target. 2. The angular difference between magnetic and

compass headings. (Joint Pub 1-02)

digital communications terminal—A handheld device that

enables users to rapidly prepare, transmit, and receive both text and

graphical messages (clear and encrypted) over standard military

radios or field wire.

direct air support center—The principal air control agency of the

U.S. Marine air command and control system responsible for the

direction and control of air operations directly supporting the

ground combat element. It processes and coordinates requests for

G-11
G-12

immediate air support and coordinates air missions requiring

integration with ground forces and other supporting arms. It

normally collocates with the senior fire support coordination center

within the ground combat element and is subordinate to the tactical

air command center. Also called DASC. (Joint Pub 1-02)

direct fire—Gunfire delivered on a target, using the target itself as

a point of aim for either the gun or the director. (Joint Pub 1-02)

direction—In artillery and naval gunfire support, a term used by a

spotter/observer in a call for fire to indicate the bearing of the

spotting line. (Joint Pub 1-02)

dispersion pattern—The distribution of a series of rounds fired

from one weapon or a group of weapons under conditions as nearly

identical as possible the points of bursts or impact being dispersed

about a point called the mean point of impact. (Joint Pub 1-02)

doubtful—In artillery and naval gunfire support, a term used by an

observer or spotter to indicate that he was unable to determine the

difference in range between the target and a round or rounds. (Joint

Pub 1.02)

down—In artillery and NGF, a term used in a call for fire to

indicate that the target is at a lower altitude than the reference point

used in identifying the target. A correction used by the

observer/spotter to indicate that a decrease in HOB is desired.
drop—In artillery and naval gunfire support, a correction used by

an observer/spotter to indicate that a decrease in range along a

spotting line is desired. (Joint Pub 1-02)

F

final protective fire—An immediately available prearranged

barrier of fire designed to impede enemy movement across

defensive lines or areas. (Joint Pub 1-02)

fire direction center—That element of a command post,

consisting of gunnery and communication personnel and

equipment, by means of which the commander exercises fire

direction andlor fire control. The fire direction center receives

target intelligence and requests for fire, and translates them into

appropriate fire direction. (Joint Pub 1-02)

fire for effect—The command to fire the ammunition in type and

quantity to achieve the amount of casualties desired for the

mission.

fire support area—An appropriate maneuver area assigned to fire

support ships from which to deliver gunfire support of an

amphibious operation. (Joint Pub 1-02)

fire support station—An exact location at sea within a fire

support area from which a fire support ship delivers fire. (Joint Pub

1-02)

G-13
G-14

full charge—The larger of the two propelling charges available for

naval guns. (Joint Pub 1-02)

fuze—A device which initiates an explosive train. (Joint Pub 1-02)

faze (specify)—In artillery and naval gunfire support, a command

or request to indicate the type of flize action desired; i.e., delay,

quick, time, proximity. (Joint Pub 1-02)

G

graze—In artillery and naval gunfire support, a spotting, or an

observation, by a spotter or an observer to indicate that all bursts

occurred on impact. (Joint Pub 1-02)

gun-target line—An imaginary straight line from gun to target.

(Joint Pub 1-02)

H

high-angle fire-Fire delivered at angles of elevation greater than

the elevation that corresponds to the maximum range of the gun

and ammunition concerned; fire, the range of which decreases as

the angle of elevation is increased. (Joint Pub 1-02)

I

immediate smoke-A mission fired, normally by a platoon, to

immediately screen or obscure the enemy and/or friendly positions

or movement.
immediate suppression—A fire-for-effect-type mission, fired

normally by battery SOP, in which a platoon fires to force the

enemy to take cover.

indirect fire—Fire delivered on a target that is not itself used as a

point of aim for the weapons or the director. (Joint Pub 1-02)

L

lateral spread—A technique used to place the mean point of

impact of two or more units 100 meters apart on a line

perpendicular to the gun-target line. (Joint Pub 1-02)

left—Denotes a shift perpendicular to the OTL.

line—In artillery and naval gunfire support, a spotting, or an

observation, used by a spotter or an observer to indicate that a

burst(s) occurred on the spotting line. (Joint Pub 1-02)

list of targets—A tabulation of confirmed or suspect targets

maintained by any echelon for informational and fire support

planning purposes. (Joint Pub 1-02)

low-angle fire—Fire delivered at angles of elevation below the

elevation that corresponds to the maximum range of the gun and

ammunition concerned. (Joint Pub 1-02)

G-15
G-16

M

maximum ordinate—The highest point along the trajectory of a

projectile. The difference in altitude (vertical interval) between the

origin and the summit.

mean point of impact—The point whose coordinates are the

arithmetic means of the coordinates of the separate points of

impact/burst of a finite number of projectiles fired or released at

the same aiming point under a given set of conditions. (Joint Pub

1-02)

0

observation post—A position from which military observations

are made, or fire directed and adjusted, and which possesses

appropriate communications; may be airborne. (Joint Pub 1-02)

observed fire fan—A device used to refine an observer's estimate

of distance in the target area.

observer-target factor—The distance from the observer to the

target expressed in thousands to the nearest thousand (for example,

the OT factor for 6,300 meters is 6).

observer-target line—An imaginary straight line from the

observer/spotter to and through the target.
P

point target—A target of such small dimension that it requires the

accurate placement of ordnance in order to neutralize or destroy it.

(Joint Pub 1-02) It is generally a target that is less than 200 meters

in length and width.

probable error—The measurement of the impact distribution in

the dispersion pattern around the MPI.

projectile—An object projected by an applied exterior force and

continuing in motion by virtue of its own inertia, as a bullet, shell,

or grenade. Also applied to rockets and to guided missiles. (Joint

Pub 1-02)

R

range spread—The technique used to place the mean point of

impact of two or more units 100 meters apart on the gun-target

line. (Joint Pub 1-02)

reduced charge—i. The smaller of the two propelling charges

available for naval guns. 2. Charge employing a reduced amount of

propellant to fire a gun at short ranges as compared to a normal

charge. (Joint Pub 1-02)

reference line-A convenient and readily identifiable line used by

the observer or spotter as the line to which spots will be related.

G-17
G-18

reference point—A prominent, easily located point in the terrain.

(Joint Pub 1-02)

refinement—A final correction sent to the FDC to move the center

of impact to the adjusted point. Refinement is always given for any

mission.

registration—The adjustment of fire to determine firing data

corrections. (Joint Pub 1-02)

right—Denotes a shift perpendicular to the OTL.

round—One shot fired by a weapon.

rounds complete—In artillery and naval gunfire support, the term

used to report that the number of rounds specified in fire for effect

have been fired. (Joint Pub 1-02)

S

salvo—i. In naval gunfire support, a method of fire in which a

number of weapons are fired at the same target simultaneously. 2.

In close air support/air interdiction operations, a method of

delivery in which the release mechanisms are operated to release or

fire all ordnance of a specific type simultaneously. (Joint Pub 1-02)

sheaf—In artillery and naval gunfire support, planned planes

(lines) of fire that produce a desired pattern of bursts with rounds

fired by two or more weapons. (Joint Pub 1-02)
shell (specify)—A command or request indicating the type of

projectile to be used.

shelling report—Any report of enemy shelling containing

information on caliber, direction, time, density and area shelled.

(Joint Pub 1-02)

ship adjust—In NGF, a method of control in which the ship can

see the target and adjust the fire.

shot—A report that indicates that a gun or guns have been fired.

splash—In artillery and naval gunfire support, word transmitted to

an observer or spotter five seconds before the estimated time of the

impact of a salvo or round. (Joint Pub 1-02)

spotting—A process of determining by visual or electronic

observation, deviations of artillery or naval gunfire from the target

in relation to a spotting line for the purpose of supplying necessary

information for the adjustment or analysis of fire. (Joint Pub 1-02)

spotting line—Any straight line to which the fall of shot of

projectiles is related or fire is adjusted by an observer or a spotter.

(Joint Pub 1-02)

spreading fire—A notification by the spotter or the naval gunfire

ship, depending on who is controlling the fire, to indicate that fire

is about to be distributed over an area. (Joint Pub 1-02)

G-19
G-20

summit—The highest altitude above mean sea level that a

projectile reaches in its flight from the gun to the target; the

algebraic sum of the maximum ordinate and the altitude of the gun.

(Joint Pub 1-02)

supporting arms—Air, sea, and land weapons of all types

employed to support ground units. (Joint Pub 1-02)

suppression of enemy air defenses—That activity which

neutralizes, destroys, or temporarily degrades surface-based enemy

air defenses by destructive and/or disruptive means. Also called

SEAD. (Joint Pub 1-02)

sustained rate of fire—Actual rate of fire that a weapon can

continue to deliver for an indefinite length of time without

seriously overheating. (Joint Pub 1-02)

T

target number—The reference number given to a target.

time of flight—In artillery and naval gunfire support, the time in

seconds from the instant a weapon is fired, launched, or released

from the delivery vehicle or weapons system to the instant it strikes

or detonates. (Joint Pub 1-02)
time on target—i. Time at which aircraft are scheduled to

attack/photograph the target. 2. The actual time at which aircraft

attack/photograph the target. (Joint Pub 1 -02)

trajectory—The path of a projectile, missile, or bomb in flight.

U

Universal time—A measure of time that conforms, within a close

approximation, to the mean diurnal rotation of the Earth and serves

as the basis of civil timekeeping. Universal Time (UT1) is

determined from observations of the stars, radio sources, and also

from ranging observations of the Moon and artificial Earth

satellites. The scale determined directly from such observations is

designated Universal Time Observed (UTO); it is slightly

dependent on the place of observation. When UTO is corrected for

the shift in longitude of the observing station caused by polar

motion, the time scale UT1 is obtained. When an accuracy better

than one second is not required, Universal Time can be used to

mean Coordinated Universal Time (UTC). Also called ZULU

time. (Joint Pub 1-02)

up—A term transmitted in a call for fire to indicate that the target

is higher in altitude than the point that has been used as a reference

point for the target location. A correction used by an observer or a

spotter to indicate that an increase in HOB is desired.

G-21
G-22

Section III. Air-Brevity Codes

Code Definition

Abort Directive to cease actionlattack/event/mission.

Angels Height of friendly aircraft in thousands of feet.

Bent System indicated is inoperative.

Bingo Fuel state needed for recovery.

Cleared hot Ordnance release is authorized.

Continue Continue present maneuver; does not imply clearance to

engage or expend ordnancà.

Cyclops Any UAV.

Dash (#) Aircraft position within a flight. Use if specific call sign

is unknown.

Laser on Directive to start laser designation.

No joy Aircrew does not have visual contact with target.

Offset (direction) Informative call indicating maneuver in a specified

direction with reference to the target.

Pushing Departing designated point.

Rope Illumination of an aircraft with an infrared pointer.

Shift Directive to shift laser illumination.

Smoke Smoke marker used to mark a position.

Snake Directive to oscillate an infrared pointer about a target.

Sparkle Target marking by infrared pointer.

Stop Stop infrared illumination of a target.

Talley Sighting of a target.
Terminate Stop laser illumination of a target.

Winchester No ordnance remaining.

(reverse blank)

G-23

Appendix H

Notes

1. Allan R. Millett, Semper Fidelis. The History of the United

States Marine Corps (New York: Macmillan Publishing Company,

1980), p. 133.

2. This was due to logistical problems (the Marines had three-inch

guns whose caliber was not in tse in France) and the decision by

Gen Pershing that there was no need for a Marine division in the

American Expeditionary Force. Millet, pp. 295 - 296. David N.

Buckner, A Brief History of the 10th Marines (Washington D.C.:

History and Museums Division, Headquarters, U.S. Marine Corps,

1981), pp. 18-20.

3. Peter B. Mersky, US. Marine Corps Aviation: 1912 to the

Present (Baltimore, MD: Nautical & Aviation Publishing Co. of

America, 1987), p. 11. On October 14, 1918, Marines of Squadron

9, 1st Marine Aviation Force, flew a mission against the

German-held railyards in Belgium. The flight of five DH-4 and

three DH-9A bombers conducted the first mission to be flown by

Marines on their own in World War I.

4. Richard P. Hallion, Strike from the Sky: The History of

Battlefield Air Attack 1911-1945 (Washington: Smithsonian

Institution Press, 1989), p. 74.

H-I
H-2

5. Fleet Marine Force Reference Publication (FMFRP) 12-15,

Small Wars Manual (April 1987), p. 9-1. FMFRP 12-15 is a reprint

of the 1940 edition of the Small Wars Manual.

6. Millett, p. 407.

7. Ibid., p. 409.

*U.S.G.P.O. 2004 307—415/10128