| Acronym | Meaning |
 | OM | Orbital Maneuvering Engine |
| CTTB | Checkout Techniques Test Bed |
| CAPS | Crew Altitude Protection System |
| ORS | Orbital Refueling System |
| SOP | Standard Operating Procedure |
| EDC | Engineering Design Change |
| RD | Round |
| HAS | Hydrogen Actuation System |
| FPE | Functional Program Element |
| E&D | Engineering And DeveloPment Directorate (JSC) |
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