| Abbreviation | Definition |
|---|---|
| HWB | Heavy Walled Building |
| HWC | Heavy Weapons Corps |
| HWCI | Hardware Configuration Item |
| HWG | Harmonization Working Group |
| HWIL | Hardware- In-the- Loop |
| HWP | Hazardous Waste Program |
| HWP | Heavy Weapon Platform |
| HWS | Heavy Weapons System |
| HWS | Holographic Weapon Sight |
| HWS | Holographic Weapon Sights |
| HWS | Holographic Weapons Sight |
| HWSTD | High Water Speed Technology Demonstrator |
| HWT | Heavy Weapons Trooper |
| HWT | Heavy Weight Torpedo |
| HX | Halifax (WW II Convoy Route) |
| HY | High Yield steel |
| HYE | High-Yield Explosives |
| HYPAK | Hydraulic Power Assist Kit |
| I | Immediate |
| I | Independent |