| Abbreviation | Definition |
|---|---|
| BTR | BroneTransporteR |
| BTRY | Battery |
| BTRYC37FABN | Arm Or Service |
| BTRYC37FABN | Battery C, 37th Field Artillery Batallion |
| BTRYCP | Battery Command Post |
| BTS | Brigade Training System |
| BTT | Branch Training Team |
| BTT | Break To Target |
| BTU | Beach Termination Unit |
| BTU | British Thermal Unit |
| BTU | British Torpedo Unit |
| BTW | Biological and Toxic Weapon |
| BTW | Biological and Toxin Weapon |
| BTWC | Biological and Toxins Weapons Convention |
| BTZ | Below The Zone |
| BUB | Battle Update Briefing |
| BUCS | Back- Up Computer System |
| BUD | Basic Underwater Demolition |
| BUD/S | Basic Underwater Demolition / Seal |
| BUDS | Basic Underwater Demolition School |