| Acronym | Meaning |
| RM/MS&C | Redundancy Management/Moding |
| TVTA | Thermal Vacuum Test Article |
| OPOV | Oxidizer Preburner Oxidizer Valve |
| SSM | Support System Module |
| DDA | ICD Departure Authorization |
| DP | Differential Pressure |
| GPS | Global Positioning System |
| ALRUTS | Automated Line Replaceable Unit Tracking System |
| R | DOTRange Rate To Target |
| PIGA | Pendulous Integrating Gyro Accelerometer |