- He-211 B1 - V tailed single fuselage-mounted jet engine business aircraft, Heinkel [DE]
- Head Light - NATO codename for Pechora radar [SU:RU]
- Head Net - NATO codename for shipboard surveillance radar [SU:RU]
- HEAP - High Explosive Armor Piercing
- Heavy Assault Bridge - M1 based bridgelayer [US]
- Heavy Cockatrice - AEC 6x4 truck-based flamethrower unit, AEC [UK]
- Heavy Ferry Bridge - Sectional pontoon ferry [UK]
- Heavy Floating Bridge - Pontoon/bailey combination bridge [UK]
- Heckler & Koch - Arms Manufacturer [DE]
- Hector - Broadside Ironclad class [UK]
- Hedgebuster - Bocage clearing device, 1944 [US]
- HEDI - High Endoatmospheric Defense Interceptor
- HEL - High Energy Laser
- Helas - Passive electronic radar reconnaissance sysem, Siemens [DE]
- HELEX - High Energy Laser Experimental
- Hellcat - Tank destroyer [US]
- Hellfire - Multi-purpose missile, Rockwell [US]
- Hellstar - Remotely piloted vehicle, IAI [IL]
- Helitow - Helicopter based version of TOW anti-tank missile, Emerson Electric [US]
- HELPS - Helicopter countermeasures dispensor, Widney Ash [UK]
- HEMTT - Series of 10-ton, 8-wheel trucks [US]
- Hendrickson - Vehicle Manufacturer [US]
- Hen House - NATO codename for soviet ABM warning and tracking radar
- Henschel - Vehicle manufacturer [DE]
- Henri Poincare - Radar picket & missile guidance vessel [FR]
- Herald - Short range Airliner, Handley Page [UK]
- Hercules - Prop Transport [US]
- Hermes - Spaceplane
- HET - Heavy Equipment Trailer [US]
- Hetz-1 - 105mm APFSDS projectile [IL]
- Hetz-2 - 120mm APFSDS projectile [IL]
- Hetzer - Tank destroyer based on TNH chassis [NS]
- Heuliez - Motor manufacturer
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