| Acronym | Meaning |
 | MG | Mobile Generator |
 | SSPM | Space Shuttle Program Manager |
 | RSMM | Redundant System Monitor Model |
 | DCSU | Digital Computer Switching Unit |
 | ROM | Rough Order Of Magnitude |
 | EML | Electromagnetic Laboratory |
 | LCD | LaunchCountdown |
 | CKS | Checks |
 | REM | Release Engine Mechanism |
 | RT | Real Time (R/T Preferred) |