| Acronym | Meaning |
| IPACS | Integrated Power And Attitude Control System |
| CSD | Chemical Systems Division |
| CSM | Command Service Module |
| CEA | Control Electronics Assembly (for MMU) |
| OFI | Operational Flight Instrumentation |
| SCU | Sequence Control Unit |
| GOSS | GrGOSSGround Operations Support System |
| ORCHIS | Oak Ridge Computerized Hierarchical Information |
| IDC | IMBLMS Digital Computer |
| DECL | Direct Energy Conversion Laboratory (JSC) |