| Abbreviation | Definition |
|---|---|
| GTFO | Get The F**k Out |
| GTI | General Trainablity Index |
| GTL | Gun-Target Line |
| GTM | Global Transportation Management |
| GTMO | Guantánamo |
| GTMVC | Ground Target Modeling and Validation Conference |
| GTN | Global Transportation Network |
| GTNC | German Territorial Northern Command |
| GTO | Gas Tires Oil |
| GTO | Global Threat Overview |
| GTO | Group Testing Officer |
| GTP | Get The Planes |
| GTS | Grant's Too Soft |
| GTS | Guards Training School |
| GTSC | German Territorial Southern Command |
| GTT | Government Technical testing |
| GTW | Go-To-War (configuration) |
| GU | Guard Unit |
| GU | Guard University |
| GUARD | US National Guard and Air Guard |