| Acronym | Meaning |
 | R&CC | Recorder And Communication Control |
| IGM | Interactive Guidance Mode |
| HPF | Horizontal Processing Facility (O&C) |
| CMA | Configuration Management Accounting |
| MSB | Most Significant Bit |
| MTG | Mounting |
| MD | Manual Direct |
| ACRC | Assured Crew Return Capability - Now ACRV |
| PHA | Preliminary Hazard Analyses |
| LCT | Launch Countdown |
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