| Abbreviation | Definition |
|---|---|
| UGM-27 | Polaris Missile |
| UGM-73 | Poseidon Missile |
| UGM-84 | Harpoon Missile |
| UGM-84A | Harpoon |
| UGM-96 | Trident Missile |
| UGM-96A | Trident I |
| UGME | UnderGround Mobile Equipment |
| UGP | Unitary Guerilla Platoon |
| UGR | Unitized Group Ration |
| UGS | Unattended Ground Sensor |
| UGT | Underground Test |
| UGV | Unmanned Ground Vehicle |
| UGW | Urban Guerilla Warfare |
| UH | Ultimate Hero |
| UH | Utility Helicopter |
| UH-60 | BLACKHAWK helicopter (originally Utility Tactical Transport Aircraft System) |
| UH-60 | Utility Helicopter |
| UHB | Ultra- High Bandwidth |
| UHC | Undershoot Hardened Circuitry |
| UHF | Ultra High Frequency |