| Acronym | Meaning |
 | PSM | Propellant Storage Module |
| SCB | Software Control Board |
| HFE | High Frequency Executive |
| SEMS | Space Environment Monitor System |
| CPL | Couple |
| PPM | Parts Per Million |
| VEEI | Vehicle Electrical Engine Interface |
| M&R | Maintenance And Refurbishment |
| ICC | Intercomputer Communication |
| RAU | Remote Acquisition Unit |
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