| Acronym | Meaning |
 | PF | Pulse Frequency |
| MCW | Modulated Continuous Wave |
| IPS | Inside Radius |
| NMAB | National Materials Advisory Board |
| FCOS | Flight Computer Operating System (Orbiter) |
| SDF | System Development Facility (Breadboard) |
| VPI | Valve Position Indicator |
| RTTV | Real-Time Television |
| LCS | Instrumentation Control SYstem |
| RAC | ReliabilitY Action Center |
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