- h – hour(s)
- H&K – Heckler and Koch
- HAB – Heavy Assault Bridge (US)
- HAG – Heavy Artillery Gun
- HALO – High Altitude Low Opening, High Activity/Low Observable
- HAMS – Headquarters and Maintenance Squadron - Marine Aircraft Group (USMC)
- HAWK – Homing-All-the-Way-Killer (US)
- HB – heavy barrel
- HBAR – Heavy Barrel Assault Rifle
- HC – Hexachloroethane/zinc
- HC – high-capacity
- HC – Hollow Charge
- HCER – high-capacity extended range
- HCHE – high-capacity high-explosive
- HCT – HOT Compact Turret
- HDS – HOLOgraphic Diffraction Sight
- HE – high-explosive
- HE-APERS – high-explosive anti-personnel
- HE-FRAG – high-explosive fragmentation
- HE-FRAG-FS – high-explosive fragmentation - fin-stabilised
- HE-FS – high-explosive - fin-stabilised
- HE-S – high-explosive spotting
- HE-T – high-explosive tracer
- HE/PR – high-explosive practice
- HEAA – High-Explosive Anti-Armour
- HEAB – High-Explosive Air Burst
- HEAP – High-Explosive Armor-Piercing
- HEAP-T – high-explosive anti-personnel - tracer
- HEAT – high-explosive anti-tank
- HEAT-FS – high-explosive anti-tank fin-stabilised
- HEAT-MP – high-explosive anti-tank multipurpose
- HEAT-MP(P) – high-explosive anti-tank multipurpose (practice)
- HEAT-T – high-explosive anti-tank - tracer
- HEAT-T-HVY – high-explosive anti-tank - tracer - heavy
- HEAT-T-MP – high-explosive anti-tank - tracer - multipurpose
- HEAT-TP-T – high-explosive anti-tank - target practice - tracer
- HED-D – Hybrid Electric Drive - Demonstrator
- HEDP – high-explosive dual-purpose
- HEER – High-Explosive Extended Range (US)
- HEF – High-Explosive Fragmentation
- HEFT – High-Explosive Follow Through
- HEI – high-explosive incendiary
- HEIT – high-explosive incendiary tracer
- HEL – High-Energy Laser (US)
- HEL – Human Engineering Laboratory (US)
- HELP – Howitzer Extended Life Program (US)
- HEMAT – Heavy Expanded Mobility Ammunition Trailer (US)
- HEMP – High-Explosive Multi-Purpose
- HEMTT – Heavy Expanded Mobility Tactical Truck (US)
- HEP – high-explosive plastic
- HEP-T – high-explosive practice - tracer
- HEPD – high-explosive point detonating
- HERA – high-explosive rocket-assisted
- HESH – high-explosive squash head
- HESH-T – high-explosive squash head - tracer
- HET-PF – high-explosive tracer - percussion fuze
- HETF – High Explosive Time Fuzed
- HETS – Heavy Equipment Transport System
- HFCC – Howitzer Fire-Control Computer (US)
- HFHTB – Human Factors Howitzer TestBed (US)
- HFM – Heavy Force Modernisation (US)
- HIFV – Heavy Infantry Fighting Vehicle
- HIMAG – High-Mobility Agility Test Vehicle (US)
- HIMARS – High-Mobility Artillery Rocket System (US)
- HIP – Howitzer Improvement Program (US)
- HIRE – Hughes Infrared Equipment
- HITP – High-Ignition Temperature Propellant
- HIU – Heading Indicator Unit
- HMC – Howitzer Motor Carriage
- HMD – Helmet-Mounted Display
- HMG – Heavy Machine Gun
- HMH – Marine Heavy Helicopter Squadron
- HMLC – High-Mobility Load Carrier
- HML/A – Marine Light/Attack Helicopter Squadron
- HMM – Marine Medium Helicopter Squadron
- HMMWV – High Mobility Multipurpose Wheeled Vehicle
- HMX – Marine Special Mission Helicopter Squadron
- HOE – Holographic Optical Element
- HOT – Haute subsonique Optiquement Téléguidé
- How – Howitzer
- HP – High Power; Hollow Point
- hp – Horsepower
- HPFP – High-Performance Fragmentation Projectile
- HPS – Helmet Pointing System (or Sight)
- HPT – high-pressure test
- HRU – Heading Reference Unit
- HS – Headquarters Squadron - Marine Wing Support Group (USMC)
- HSS – Hunter Sensor Suite
- HSTV(L) – High-Survivability Test Vehicle (Lightweight) (US)
- HTTB – High-Technology TestBed (US)
- HVAP – high-velocity armour-piercing
- HVAP-T – high-velocity armour-piercing tracer
- HVAPDS-T – high-velocity armour-piercing discarding sabot - tracer
- HVAPFSDS – high-velocity armour-piercing fin-stabilised discarding sabot
- HVCC – High Velocity Canister Cartridge
- HVM – Hypervelocity Missile
- HVSS – horizontal volute spring suspension
- HVSW – Hypervelocity Support Weapon
- HVTP-T – high-velocity target practice - tracer
- HWSTD – High Water Speed Technology Demonstrator
- HYPAK – Hydraulic Power Assist Kit
Read more about this topic: Glossary Of Military Abbreviations