| Abbreviation | Definition |
|---|---|
| GC | Geneva Convention Relative to The Protection of Civilian Persons In Time of War |
| GC | Green Camouflage |
| GC | Guarded Command |
| GC3A | Global Command, Control, and Communications Assessment |
| GC4A | Global Command, Control, Communications, and Computer Assessment |
| GCA | German Construction Administration |
| GCA | Ground Control Airborne |
| GCA | Ground Controlled Approach |
| GCB | Grand Commander of the Bath |
| GCC | Gaining Command Code |
| GCC | Geographic Combatant Commander |
| GCC | Global Command and Control |
| GCC | Global Contingency Construction |
| GCC | Ground Component Commander |
| GCC | Gulf Cooperation Council |
| GCCC | Global Contingency Construction Contract |
| GCCS | Global Command and Control System |
| GCCS(A) | Global Command and Control System - Army |
| GCCS-A | Global Command and Control System - Army |
| GCCS-A | Global Command and Control System-Army |