| Acronym | Meaning |
| SIMAS | System |
| EGRET | Energetic Gamma Ray Explorer Telescope |
| H | AlH AlMomentum |
| CSD | LCharles Stark Draper Laboratory (MIT) |
| IOB | InPut/Output Box |
| GAO | General Accounting Office |
| MWV | Mmwv Maximum Working Voltage |
| HIU | Headset Interface Unit |
| FED | Flight Events Demonstration |
| FRCS | Forward Reaction Control System (Subsystem) |