| Acronym | Meaning |
 | GC | Guidance Control |
| GC | Gyrocompassing |
| GCA | Ground Controlled Approach |
| GCC | Ground Control Center |
| GCC | Ground Communications Coordinator |
| GCCO | Ground Control Checkout |
| GCD | Gyrc)-Compass |
| GCDC | Ground Checkout Display And Control |
| GCDCS | Ground Checkout Display And Control System |
| GCE | Ground Checkout Equipment |
| GCF | Ground Communications Facility |
| GCHX | Ground Cooling Heat Exchanger |
| GCI | Ground Controlled Interception |
| GCIL | Ground Command Interface Logic |
| GCIL | Ground Control Interface Logic |
| GCILC | Ground Command Interface Logic Controller |
| GCILU | Ground Control Interface Logic Unit |
| GCL | Ground Coolant Loop |
| GCL | Ground Control Landing |
| GCN | Ground Communications Network (A/G Worldwide Net) |
| GCN | Ground ControlNetwork |
| GCO | Ground Checkout |
| GCOS | General Computer Operational System |
| GCOS | Ground Computer Operating System |
| GCR | Ground Controlled Radar |
| GCS | Ground Communications System |
| GCS | Guidance Cutoff Signal |
| GCTS | Gas Component Test Stand |
| GCTS | Ground Communication(s) Tracking System |
| GCU | General Control Unit |
| GCU | Generator Control Unit |
| GCU | Ground Cooling Unit |
| GCU | Gyro Coupling Unit |
| GCV | Gaseous Oxygen Control Valve |
| GD | Guard |
| GDA | Gimbal Drive Actuator/Assembly |
| GDBS | Generalized Data Base System |
| GDC | General Dynamics Convair |
| GDC | Gyro Display Coupler |
| GDP | Generalized Documentation Processor |
| GDS | Goldstone |
| GDS | GNC Dynamic Simulator |
| GDSD | Ground Data SYstems Division |
| GDSM | Ground Data Systems Manager |
| GDSO | Ground Data Systems Officer |
| GDSSR | GDSD Staff Support Room |
| GDX | Goldstone |
| GE | General Electric |
| GECALL | GCOS Program Element Name |
| GEDAC | General Electric Detection And Automatic Correction |
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