| Abbreviation | Definition |
|---|---|
| BLE | Baseline Environment |
| BLG | British Light Gun |
| BLIN | Budget Line Item Number |
| BLIS | Basic Load Inspection System |
| BLIS | Building Lifecycle Interoperable Software |
| BLITC | Battle Lab Integration, Technology, and Concepts |
| BLITCD | Battle Lab Integration, Technology, and Concepts Directorate |
| BLK | Block |
| BLMC | Breech Loading Metallic Cartridge |
| bln | balloon |
| BLOS | Beyond Line-Of-Sight |
| BLPCC | Brigade Level Pre-command Course |
| BLR | Breach Loading Rifle |
| BLR | Browning Lever Rifle |
| BLRIP | Beyond Low Rate Initial Production |
| BLRM | Battalion Logistics Requirements Model |
| BLRSI | Battle Lab Reconfigurable Simulator Initiative |
| BLS | Basic Leadership School |
| BLS | Beach Landing Site |
| BLSE | Battle Lab Support Element |