| Abbreviation | Definition |
|---|---|
| UNSUB | Unidentified Suspect |
| UNSUB | UNknown SUBject |
| UNSUB | Unsubstantiated Subject |
| UPR | Uncontested Physical Research |
| USA | United States Attorney |
| USAINTA | United States Army INTelligence Agency |
| USC | United States Court |
| USDA | United States Department of Agriculture |
| USDS | United States Department of State |
| USRT | Underwater Search and Recovery Team |
| USSR | Union of Socialist Soviet Republics |
| UTL | Unable To Locate |
| VBIE | Virtual Bug In Ear |
| VBIED | Vehicle-Borne Improvised Explosive Device |
| VIDEM | VIetnam DEMonstration |
| VOT | Voluntary OverTime |
| VPA | Visitor Pattern Analysis |
| VPP | Voluntary Protection Program |
| VUFA | Violation of Uniform Firearms Act |
| WA | With Alias |