| Abbreviation | Definition |
|---|---|
| GATB | Gillian Anderson Testosterone Brigade |
| GATB | Guidance, Apportionment, and Targeting Board |
| GATES | Global Air Transportation Execution System |
| GATO | Gaming Associated Treaty Organization |
| GATS | GPS-Aided Targeting System |
| GAU | Gun, Aircraft Unit |
| GAWA | Green and White Army |
| GAWR | Gross Axle Weight Rating |
| GB | GigaByte |
| GB | Group Buffer |
| GB | Sarin, A Nerve Agent |
| GBA | God Bless America |
| GBA | Great Blasting Action |
| GBCS | Ground-Based Common Sensors |
| GBCS-H | Ground-Based Common Sensors (Heavy) |
| GBCS-L | Ground-Based Common Sensors (Light) |
| GBDL | Ground Based Data Link |
| GBE | Greatest Blitz Ever |
| GBI | Ground-Based Interceptor |
| GBM | Great Big Maps |