| Abbreviation | Definition |
|---|---|
| UBO | Uniform Business Office |
| UBR | Utility / Battle Rifle |
| UBRAT | Unfair Blame Reparations Army Territory |
| UC | Under Control |
| UC | Unit Cell |
| UC | Universal Combat |
| UC | Until Changed |
| UCA | Unenclosed Covered Area |
| UCAS | Unmanned Combat Air System |
| UCAV | Unmanned Combat Aerial Vehicle |
| UCBT | Upright Citizens Brigade Theatre |
| UCC | urgent care center |
| UCC | urgent care clinic |
| UCCATS | Urban Combat Computer-Assisted Training Simulation |
| UCCIS | USAREUR Command and Control Information System |
| UCF | Under Cover Freak |
| UCF | United Coalition Forces |
| UCFF | Unit Type Code Consumption Factors File |
| UCFF | UTC Consumption Factors File |
| UCI | Unit Compliance Inspection |