| Abbreviation | Definition |
|---|---|
| GAAT | General Agreement on Tariffs and Trade |
| GAC | General Advisory Committee |
| GAC | George Armstrong Custer |
| GACC | Ground Attack Control Center |
| GACIAC | Guidance and Control Information Analysis Center |
| GAF | Gay Army Frankfurt |
| GAF | German Armed Forces |
| GAF | ground action forces |
| GAF | Guardia Alla Frontiera |
| GAFB | German Armed Forces Badge |
| GAFB | Glasstown Antique Fire Brigade |
| GAFE | Grupo Aeromóvil de Fuerzas Especiales (Mexican Army) |
| GAFS | General Accounting and Finance System |
| GAG | Ground Air Ground |
| GAGAN | GPS Aided Geo Augmented Navigation System |
| GAK | Government Access To Keys |
| GALE | Generic Area Limitations Environment |
| GAM | Geographical Analysis Machine |
| GAM | GPS-Aided Munition |
| GAMI | General Authority for Military Industries |