H
- HALO – High Altitude Low Opening (Airborne)
- HE – High Explosive
- HEAT – High Explosive Anti-Tank warhead
- HMAS – Her Majesty's Australian Ship (Australia)
- HMCS – Her Majesty's Canadian Ship (Canada)
- HMFIC – Head Motherf*cker In Charge – colloquialism for the highest-ranking person present; more commonly used by NCO's than by officers (U.S. Military)
- HMMWV – High Mobility Multipurpose Wheeled Vehicle (U.S. Military)
- HMNZS – Her Majesty's New Zealand Ship (New Zealand)
- HMS – Hans Majestäts Skepp (His Majesty's ship, Sweden)
- HMS – Her Majesty's Ship (Royal Navies such as Royal British Navy) (His Majesty's Ship if King)
- HOMSEC – Homeland Security
- HQ – Headquarters
- HUMINT – Human Intelligence
- HYT – High Year Tenure (USAF)
Read more about this topic: List Of U.S. Government And Military Acronyms