| Acronym | Meaning |
 | DM | Document |
| MSU | Measuring Stimuli Units |
| EFCS | Earth Fixed Coordinate System |
| DEF | Definition |
| OPS | Orbiter Project Schedules |
| PIP | Plant Instrumentation Program |
| VIU | Video Interface Unit |
| M | Icom Missile Command (Army) |
| PMC | Procurement Method Code |
| RECS | Representative Shuttle Environmental Control System |
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