NASA Abbreviations and Acronyms

1. GCL
   Ground Control Landing
2. GCL
   Ground Coolant Loop
3. GCM
   Ground Control Message
4. GCMR
   Ground Control Message Request
5. GCN
   Ground Controlnetwork
6. GCO
   Ground Checkout
7. GCOS
   Ground Computer Operating System
8. GCOS
   General Computer Operational System
9. GCR
   Ground Controlled Radar
10. GCS
    Ground Communications System
11. GCS
    Guidance Cutoff Signal
12. GCTS
    Gas Component Test Stand
13. GCTS
    Ground Communication(s) Tracking System
14. GCU
    Ground Cooling Unit
15. GCU
    Gyro Coupling Unit
16. GCU
    General Control Unit
17. GCV
    Gaseous Oxygen Control Valve
18. GD
    Ground Detector
19. GD
    Guidance
20. GD
    Ground

Last updated: May 6, 2025 — Total entries: 14,020