| Acronym | Meaning |
 | V/M | Velocity Meter |
| ORB | 1 -g Orbiter One-g (trainer) |
| RADCC | Radiation Control Center |
| MD | Mission Director |
| DFCS | Digital Flight Control Software (System) |
| QPSK | Quadrature Phase Shift Key |
| PCO | Program Controlled Output |
| INSTRUM | Instrumentation Subsystem |
| TVCS | Thrust Vector Control System |
| CSM | Command Service Module |
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