| Abbreviation | Definition |
|---|---|
| GITMO | Government's Incarceration for Terrorist Military Operatives |
| GIU | Graphic Interface Unit |
| GIUK | Greenland, Iceland, United Kingdom gap |
| GIW | Global Information Warfare |
| GIW | Graphics Information Workstation |
| GJ | Germans and Japanese |
| GJ | Grenade Jump |
| GK | Golden Knight |
| GK | Good Kill |
| GKF | Guidance Kalman Filter |
| GKS | Graphical Kernel System |
| GKS | Grendle Killing System |
| GL | Gassed Lungs |
| GL | Generic List |
| GL | Ginzburg Landau |
| GL | Government Leased |
| GLA | Global Liberation Army |
| GLAC | General Ledger Accounting Code |
| GLAD | Ground Laser Attack Designator |
| GLADIS | Ground Laser Attack Designator/Identification System |