Structure of the UNSC Army (UNSC Refined)

The UNSC Army contains many sub units in it's order of battle and many different types of organizations to provide capabilities for the Army to carry out the UEG's Foreign and Domestic Policy to help combat insurrectionists and Covenant remnants. The UNSC Army is largely based on Division-centric operations where most brigade groups are permanently attached units to a division (except for Independent Brigade Groups) and deployed with the division.
==Nature of Formations==
The differing capabilities of the various formations of the UNSC Army means that units are generally divided into 3 different categories: Commands, Formations, Units and Subunits.
Commands are described in the 2555 Army Reform as "the administrative and executive command of a region under the command of a general and is capable of representing the UEG." Commands operate not only as a military but also a semi-political position, commands are able to form temporary military control under a temporary off-world civilian administration on planets and regions under threat with permission from cabinet. 
Formations are described in the 2555 Army Reform as "2 or more ground or air units proceeding together under a single commander." Formations are generally combined arms groups capable of performing military operations independently of other units for limited periods. These groups are formed with number of integrated or operationally attached units and sub-units, usually these are combat capable such as infantry and armor. Some formations include: Divisions, Brigade Groups, Battalions, etc. Some formations are temporary ad-hoc units formed together in order to achieve a limited goal, these are typically known as Task Forces.
Units are described in the 2555 Army Reform as "a single arm homogenous organization typically having only 1 capability." Units are generally unable to perform other tasks than is designated to them. These units generally do not have integrated or operationally attached units or sub-units, units that do only have those units in order to further their single capability rather than provide them with another. Subunits are units that are subordinate to units.
==Hierarchy of the UNSC Army==
Joint Forces Symbol	Name 	Nature 	Strength 	Constituent units 	Commander or leader
80px 	Army Command 	Command 	800,000–1,000,000	3-4 Corps Groups 	OF-10: General
 	Army 	Command 	340,000 	2 Corps Groups 	OF-10: General
 	Corps Group 	Command 	90,000–250,000 	2–4 Corps 	OF-10: General
 	Corps 	Formation 	40,000–80,000 	4-6 Divisions 	OF-9: Lieutenant General
 	Division 	Formation 	9,500 - 18,000 	3-4 Brigade Groups 	OF-7: Brigadier GeneralorOF-8: Major General
 	Brigade Group 	Formation 	3,000 - 6,000 	3–15 Battalions or equivalent	OF-6: ColonelorOF-5: Lieutenant Colonel
 	Battalion or equivalentRegiment (Artillery, Medical and Engineers)Squadron (Cavalry)	Unit 	250 - 900 	3-5 Companies or equivalent 	OF-5: Lieutenant Colonel or OF-4: Major
 	Company or equivalent Battery (Artillery) Squadron (Engineers and Aviation) 	Unit or Subunit	78–180 	3-4 Platoons or equivalent 	OF-3: MajorOF-2: Captain
 	Platoon or equivalentTroop (Cavalry, Engineers and Aviation) 	Subunit 	26–45 	2-3 Squads or equivalent 	OF-1: First or Second Lieutenant
 	Squad or equivalent Section (Mortars, Armor and Cavalry) 	- 	6–12 	2-3 Fireteams or equivalent 	E-6: Staff SergeantE-5: Sergeant
 	Fireteam or equivalent Team (Heavy Weapons) 	- 	2–4 	n/a 	E-4: Corporal E-4: Specialist E-3: Private First Class
=Organizations=
==Regular Army==
===Army Command===
Army Commands are the largest command in the UNSC Army, the Army Commands are tasked to oversee the military administration and operations of the 3 main colony regions in the UNSC (Sol, Inner and Outer Colonies) and are under the command of a senior OF-10 General. These commands can be multi-service commands with attached Air Force, Navy and Marine formations and units on a temporary basis.
The UNSC Army currently has 3 Army Commands:
* UNSC Army Inner Colonies (ARIC)/First Army Command
* UNSC Army Outer Colonies (AROC)/Seventh Army Command
* UNSC Army Sol (ARSOL)/Third Army Command
Typically, UNSC Army Commands follow a TO&E structure of:
*Command Headquarters
* 4 Corps Groups
*A Signal Command
* An Administration Center
* A Theatre Air and Missile Defense Command
*A Sector Sustainment Command
*A Training Command
*A Sector Coordination Command
*An Intelligence Center
*A Medical Command
*A Transportation Command
*A Reserve Command
Commands can also be assigned with various other formations such as specialist schools and task forces, local support units and attached CMA units.
===Army===
The Army used to be more prominent, during the Human-Covenant War there were many Armies amongst the UNSC Army and they comprised most of the UNSC Army's combat power. However, with the end of the war saw the focus shift from the Army to the more independent operations of the Corps Group. 
There still remains a single Army, the Tenth Army, which was retained due to the lessened defensive duties of the Shield Worlds. With only a few shield worlds and their stretched out nature meant that there was no need for an entire Army Command to be deployed for their protection which meant that HIGHCOM elected to retain the Tenth Army
Tenth Army under TO&E is structured as:
*Army Headquarters
* 1st Corps Group
** II Corps
** X Corps
** LI Corps
** XLV Corps
** XVII Corps
* 50th Airborne Corps Group
** I Airborne Corps
** XXX Airborne Corps
** XXXIV Airborne Corps
** CX Airborne Corps
* 604th Theatre Sustainment Command
* 77th Signal Command
===Corps Group===
The Corps Group is a non-permanent formation and is the primary organization concerned with administration within operations in a planetary system. Whilst the Army and Army Commands are concerned with administration within groups of systems, the Corps Groups are usually in control over the operations occurring within a singular system.
There are currently active 15 Corps Groups within the UNSC Army as well 48 deployable Corps Group Headquarters, in times of crisis then Corps Groups are activated within their numbers being made from Divisions in various Reserve Commands from the Active Reserve as well as Corps from the Regular Army. Traditionally, this mean reducing the number of Corps in a regular Army Corps Group from 4 to 3.
There are 3 types of Corps Groups in the UNSC Army, the Corps Group, the Armored Corps Group and the Airborne Corps Group.Corps Groups consist of regular Corps which are traditionally a mixture of mechanised and armored infantry formations as well as armored divisions. These allow for a combined arms force with elements able to be easily transportable by either the Air Force and Navy without lowering their combat power.
Armored Corps Groups consists of Armored Corps, these are entirely filled with armored divisions with all the infantry being armored infantry in the Hyrax Infantry Fighting Vehicle. This large amount of armored vehicles means that their divisions have a lot of combat power but their large abundance of armored vehicles means that elements are not as easily transportable by either the Air Force and the Navy which limits their strategic mobility in comparison to the regular or Airborne Corps Group.
Airborne Corps Groups consists of Airborne Corps These are light infantry units based around lighter vehicles such as the Warthog instead of the Mastodon of the regular infantry or the Hyrax of the armored infantry. They are lighly equipped compared to their counterparts with less heavy weapons and a great focus on individual marksmanship and fitness. These make Airborne Corps Groups very mobile, they only use light and air-droppable vehicles and can deploy en mass via aircraft but their lack of heavy weapons and armor means they generally lack in combat power. 
Typically, UNSC Corps Group follow the TO&E structure of:
*Corps Group Headquarters
*3-5 Corps
*A Signal Brigade
*A System Sustainment Command
*Tactical Air Control Wing (only in Airborne Corps)
*Air Defense Brigade (only in Airborne Corps)
===Corps===
Corps Groups are non-permanent formations tasked with combat operations and administrative command within operations on a planet. Generally Corps are considered to be quite small considering their operations area and as such the Corps generally conducts it's operations in a fairly small area with support from local planetary defense force as well as independent brigade groups based on the world. 
There are currently 58 Corps in the Regular Army whilst there is provision for a further 200 Corps to be mobilised from the various independent brigade groups assigned to worlds as well as divisions from the Active Reserve and composite formations from the Standby Reserve. These Corps are assigned to a deployable Corps Group Headquarters for operations. 
Like the Corps Groups, Corps follow a similar structure with 3 types of Corps in the Regular Army with the regular Corps Group, Armored Corps Group and Airborne Corps.
Corps are a combined arms mechanised formation, consisting of a mixture of armored divisions and mechanised infantry divisions. As with the Corps Group, these formations are very adaptable and consist of a good mixture of strategic mobility and combat power with elements of the Corps able to easily deploy to conflict regions without the need to leave behind their heavy equipment and vehicles.
A typical regular Corps consists of:
* Corps Headquarters
* 2-4 Infantry Divisions
* 1-2 Armored Division
* 1 Artillery Brigade Group
* 1 Planetary Sustainment Command
* 1 Air Defense Brigade Group
* 1 Military Police Brigade Group
* 1 Engineer Brigade Group
Armored Corps are combined arms armored formations, consisting entirely of Armored Divisions and Independent Armored Brigades. These Corps place a premium on high combat power and lack the strategic mobility to move from continent to continent or planet to planet. However, Armored Corps are tactically flexible as their Independent Bridge Groups are designed to operate in long periods during armored spearheads through the enemy.
A typical Armored Corps consists of:
* Corps Headquarters
* 3-4 Armored Divisions
* 1-2 Independent Armored Brigade Groups
* 1 Artillery Brigade Group
* 1 Planetary Sustainment Command
* 1 Air Defense Brigade Group
* 1 Military Police Brigade Group
* 1 Armored Engineer Brigade Group
Airborne Corps are limited combined arms light infantry formations, traditionally they consist only of Airborne Divisions who are equipped as light infantry with only a few vehicles. However, the XXXIV Airborne Corps consists of the 11th Airborne Armored Division. This formation is equipped with the Serpent Mobile Firepower System, an assault gun based on the Cobra, as well as the Cobra MBT. However, every other Airborne Division is an all light infantry formation operating mainly Warthogs and Mongooses. 
* Corps Headquarters
* 4-5 Airborne Divisions
* 1 Artillery Brigade Group
* 1 Planetary Sustainment Command
* 1 Airborne Engineer Brigade Group