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  Critical FSCs
  Critical Federal Stock Classes Due to national security concerns, some federal stock classes (FSC's) require a higher degree of documentation when being turned in under a local stock number opposed to a cataloged national stock number. These critical FSCs must be turned in with following information on or attached to the DD 1348-1A Appropriate FSC
 Manufacturer name and valid part number
 Nomenclature which accurately describes the item
 End item application
 Clear text statement explaining why the NSN is not included National Stock Number page
  Critical FSCs FSG/FSC
   DESCRIPTION10 (All)
   Weapons11 (All)
   Nuclear Ordnance12 (All)
   Fire Control Equipment13 (All)
   AE14 (All)
   Guided Missiles1560
   Airframe Structural Components1670
   Parachutes: Aerial Pick Up, Delivery, Recovery1710
   Aircraft Landing Equipment1720
   Aircraft Launching Equipment1810
   Space Vehicles1820
   Space Vehicle Components1830
   Space Vehicle Remote Control Systems1840
   Space Vehicle Launchers1905
   Combat Ships and Landing Vessels2305
   Ground Effect Vehicles2330
   Trailers2350
   Combat, Assault, and Tactical Vehicles, Tracked2840
   Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components2845
   Rocket Engines and Components2915
   Engine Fuel System Components, Aircraft and Missile Prime Movers3690
   Specialized Ammunition and Ordnance Machinery and Related Equipment4230
   Decontaminating and Impregnating Equipment4470
   Nuclear Reactors4921
   Torpedo Maintenance, Repair, and Checkout Specialized Equipment4923
   Depth Charges and Underwater Mines Maintenance, Repair, and Checkout Specialized Equipment4925
   Ammunition Maintenance, Repair, and Checkout Specialized Equipment4927
   Rocket Maintenance, Repair, and Checkout Specialized Equipment4931
   Fire Control Maintenance and Repair Shop Specialized Equipment4933
   Weapons Maintenance and Repair Shop Specialized Equipment4935
   Guided Missile Maintenance, Repair, and Checkout Specialized Equipment4960
   Space Vehicle Maintenance, Repair, and Checkout Specialized Equipment5810
   Communications Security (COMSEC) Equipment and Components5811
   Other Cryptologic Equipment and Components5820
   Radio and Television Communication Equipment, Except Airborne5821
   Radio and Television Communication Equipment, Airborne5825
   Radio Navigation Equipment, Except Airborne5826
   Radio Navigation Equipment, Airborne5840
   Radar Equipment, Except Airborne5841
   Radar Equipment, Airborne5845
   Underwater Sound Equipment5850
   Visible and Invisible Light Communication Equipment5855
   Night Vision Equipment, Emitted and Reflected Radiation5860
   Stimulated Coherent Radiation Devices, Components, and Accessories5865
   Electronic Countermeasures, Counter-Countermeasures, and Quick Reaction Capability Equipment5963
   Electronic Modules5985
   Antennas, Waveguides, and Related Equipment5998
   Electrical and Electronic Assemblies, Boards, Cards, and Associated Hardware5999
   Miscellaneous Electrical and Electronic Components6615
   Automatic Pilot Mechanisms and Airborne Gyro Components6920
   Armament Training Devices6930
   Operation Training Devices6940
   Communication Training Devices8470
   Armor, Personal8475
   Specialized Flight Clothing and Accessories  Critical Buzz Word List
    A-D Ablative
Accelerometer
Afterburner
Aiming Device
Amphibious
Amplifier
Antenna
Armor
Astro Compass
AHRS
Ballistic
Beacon
Bomb(ing)
Breech
Camouflage
Carriage
Cartridge
Cathode Ray
Chaff
CCA
Classified
Cold Cathode
Collimator
Composite
COMSEC
Countermeasures
Crypto
Crystal
Decoder
Delay
Detonating
Detector
 D-M Doppler
Ejector
Electromagnetic Pulse
Electronic Countermeasures
Electronic Warfare
Electro-Optical
Encoder
Equilibrator
Feeder (Ammo)
Filter RF
Fire Control
Firing Mechanism
Frequency Generator
Guidance
Gunsighting
Gyro (scope)
Height Finder
IFF
Image Intensifier
Inertial
IR
Interception
Klystron
Krytron
Laser
Launcher
Linker/Delinker
Logic
Magnetron
MASER
Memory
Metal Embrittling
 M-Z Mine
Missile
Modulator
Night Sight(ing)
Nuclear
Optic (al)
Oscillator
Particle Beam
Periscope
Processor(ing)
Projectile
Pylon
Radar
Radome
Range Finder
Receiver
Research & Development (R&D)
Scope
Sight
Sonar
Spotting Device
Spryton
Star Tracker
Synchronizer
Target(ing)
Telescopic
Tempest
Transmitter
Traveling Wave Tube
Waveguide
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