| Acronym | Meaning |
| LOP | Input/Output Processor |
| NAS | National Academy Of Sciences |
| OCM | Organic Content Monitor |
| CRES | Corrosion Resistant Steel |
| SCMB | Development Configuration Management Board |
| LAT | Lateral |
| PUCS | Propellant Utilization Control System |
| W-G | Water-Glycol |
| RIV | Recirculation Isolation Valve |
| GCIL | Ground Command Interface Logic |