| Acronym | Meaning |
| OV | Orbiter Vehicle |
| RSS | Root Sum Square |
| E | LSSEmergency Life Support System |
| RAX | Remote Access Computing System |
| PACAS | Personnel Access Control Accountability System |
| MAEP | Minimum Autoland Entry Point |
| SERB | Systems Engineering Review Board |
| L&T | Laboratory And Test |
| MILSTRIP | Military Standard Requisition And Issue Procedure |
| COMEC | Communications Security |