| Abbreviation | Definition |
|---|---|
| TSDF | TACAIR (Tactical Air) System Development Facility |
| TSE | TAACOM (Theater Army Area Command) Support Element |
| TSE | Tactical Support Element |
| TSE | TOC (Tactical Operations Center) Support Element |
| TSEC | Transmission Security |
| TSED | Tactical Support Equipment Division |
| TSEEC | Transmission Systems Engineering Evaluation Facility |
| TSEU | Technology Seeker Evaluation Unit |
| TSF | The Special Forces |
| TSG | Targeting Support Group |
| TSG | Test Signal Generator |
| TSG | The Surgeon General |
| TSGCE | Tri-Service Group On Communications and Electronics |
| TSGCEE | Tri-Service Group On Communications and Electronic Equipment (NATO) |
| TSGT | Technical Sergeant |
| TSI | The Silent Interrogators |
| TSI | TRADOC (TRAining and DOCtrine Command) Simulation Internet |
| TSI | TRADOC Simulation Internet |
| TSID | Target System Interface Drawing |
| TSIP | Task Force XXI System Integration Plan |