| Abbreviation | Definition |
|---|---|
| GCCS-I3 | Global Command and Control System Integrated Imagery and Intelligence |
| GCCS-J | Global Command and Control System - Joint |
| GCCS-J | Global Command and Control System-Joint |
| GCCS-M | Global Command and Control System - Maritime |
| GCCS-M | Global Command and Control System-Maritime |
| GCCS-N | Global Command and Control System - Navy |
| GCE | Ground Combat Element |
| GCE | Ground Combat Element (MAGTF) |
| GCG | Ground Control Group |
| GCHQ | Government Communications HeadQuarters |
| GCI | Ground-Controlled Intercept |
| GCM | General Court Martial |
| GCM | Global Container Manager |
| GCM | Global Information Grid (GIG) Content Management |
| GCM | Ground Control Manual |
| GCN | Global Communications Network |
| GCN | Ground Control Network |
| GCO | Ground Control Operator |
| GCOS | General Comprehensive Operating System |
| GCP | Geospatial-Intelligence Contingency Package |