| Acronym | Meaning |
| SS&A | Space Systems And Applications |
| CMO | Configuration Management Office |
| SRCBD | Software Requirements Control Board Directive |
| FRCS | Forward Reaction Control System (Subsystem) |
| MSI | Maintenance Significant Items |
| SEC | Secondary |
| OCDU | Optics Coupling Data Unit (G&N) |
| PRS | Power Reactant System (Subsystem) |
| TK | Tank |
| NET | PositivNet Positive Suction Pressure |