| Acronym | Meaning |
| CISS | Centaur Integrated Support Structure |
| TVCS | Thrust Vector Control System |
| CTA | Computer Technology Associates (GSFC) |
| OTV | Orbiter Transfer Vehicle |
| EHR | Earned Hour Ratio |
| VMS | Velocity Measuring System |
| COFW | Certificate Of Flight Worthiness |
| DOL | Discrete Output Low |
| IAS | Impact Assessment Sheet |
| OS | Operating Software |