| Acronym | Meaning |
 | MOC | Mission Operations Computer |
| MSC | Manned Spacecraft Center (changed To JSC) |
| TU | Transport Unit |
| FID | Flight Implementation Directive |
| DOD | Department Of Defense |
| PICS | Photo Index And Cataloging System |
| SIT | Shuttle Integrated Test |
| MMC | Martin Marietta Corporation |
| DCU | Digital Computer Unit |
| TT | Terminal Timing |
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