| Acronym | Meaning |
 | MUSS | Module Utility Support Structure |
| MSFN | Manned Space Flight Network |
| SPS | Service Propulsion Subsystem |
| SSO | Source Selection Official |
| SDIF | Software Development And Integration Facility |
| TER | Time Estimating Relationship |
| SDD | Software DescriPtion Document |
| GEOSEPS | General Summary Edit Program |
| ORB | 1 -g Orbiter One-g (trainer) |
| SUB | Substitute |
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