| Acronym | Meaning |
 | VMS | Velocity Measuring System |
| PGRWG | Payload Ground Requirements Working Group |
| IMDB | Integrated Maintenance Data Base |
| P/Y | Pitch/Yaw |
| IPS | IRV Isotope Reentry Vehicle |
| STS | Space Transportation System |
| OFTR | Orbital Flight Test Requirement |
| HF | Horizontal Flight |
| SF | Sliding Filter |
| MMCL | Master Measurement And Control List |
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