| Abbreviation | Definition |
|---|---|
| GUN | Gunner |
| GUN | nner |
| GUNSMITH | Gunsmith |
| GUNSMITH | nsmith |
| GY | Gunner's Yeoman |
| GY | nner's Yeoman |
| HA | Hospital Apprentice |
| HA | spital Apprentice |
| HA1 | Hospital Apprentice 1st Class |
| HA1 | spital Apprentice 1st Class |
| HA2 | Hospital Apprentice 2nd Class |
| HA2 | spital Apprentice 2nd Class |
| HA3 | Hospital Apprentice Third Class |
| HA3 | spital Apprentice Third Class |
| HALO | Hypersonic Air-Launched Offensive |
| HK | Hunter Killer |
| HM1 | Hospital Corpsman Petty Officer 1st Class |
| HM1 | spital Corpsman Petty Officer 1st Class |
| HM2 | Hospital Corpsman Petty Officer 2nd Class |
| HM2 | spital Corpsman Petty Officer 2nd Class |