| Acronym | Meaning |
| GCOS | General Computer Operational System |
| OPBOV | Oxidizer Preburner Oxidizer Valve |
| T.P. | Transition Period |
| TVSA | Thrust Vector Control Servoamplifier |
| MG | Middle Gimbal (YAW) |
| INTV | Interim Hypersonics Test Article |
| SRSR | Schedule And Resources Status Report |
| MSC | Master Sequence Controller |
| CCA | Coolant Control Assembly |
| PMS | Performance Monitoring System |