| Acronym | Meaning |
 | GCOS | General Computer Operational System |
| OPFC | Orbiter Preflight Checklist |
| OP | Oxygen Purge |
| MS | Mating Sequence And Control |
| MCDS | Maintenance Control And Display System |
| NSR | National Slow Rate |
| PDU | Pulse Detection Unit |
| COBE | Cosmic Background Explorer |
| SMD | Special Measuring Service |
| OSM | Orbital Service Module |
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