NASA Abbreviations and Acronyms

1. SESL
   Space Environmental Simulation Laboratory
2. SSTS
   Star Simulator Test Stand
3. TT&C
   Telemetry, Tracking, and Commanding
4. AFPD
   Authorization for Program Development
5. AFSPC
   Air Force Space Command
6. COMSEC
   Communications Security
7. GC / GNC
   Guidance and Control
8. PATP
   Preliminary Authority To Proceed
9. T.O.
   Takeoff
10. T.O.
    Test and Operations
11. T.O.
    Takeover
12. ADPS
    Acceptance Data Package System
13. J/T
    Joule-Thompson
14. ACRV
    Assured Crew Return Vehicle
15. ADPSSM
    ADP system security monitor
16. AFSATCOM
    Air Force Satellite Communications System
17. AFSATCOM
    Air Force satellite communication(s)
18. AFSPACECOM
    Air Force Space Command
19. AIST
    Abbreviated Integration System Test
20. AIST
    Agency of Industrial Science and Technology (Japan)

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