| Abbreviation | Definition |
|---|---|
| ITSA | Information Technology Security Awareness |
| ITSB | Information Technology Systems Bridge |
| ITT | Integrated Training Team |
| ITTD | Interim Tactical Terrain Data |
| ITTS | Instrumentation, Targets, and Threat Simulator |
| ITU | Interrogator Translator Unit |
| ITV | In-Transit Visibility |
| ITW/AA | Integrated Tactical Warning and Attack Assessment |
| ITWAA | Integrated Tactical Warning and Attack Assessment |
| IU | Interface Unit |
| IUAS | Intelligent Unmanned Aircraft Systems |
| IUC | Independent User Center |
| IUID | Item Unique Identification |
| IULS | Integrated Update of Legacy Systems |
| IUS | Improved Unarmed Strike |
| IUW | Inshore Undersea Warfare |
| IUWG | Inshore Undersea Warfare Group |
| IVA | Individual Voluntary Arrangement |
| IVA | Intelligence Virtual Architecture |
| IVAN | Insane Volunteering Army Novice |