| Acronym | Meaning |
 | OPGUID | OPtimum Guidance (Technique) |
| HCED | Hand Controller Engage Driver |
| SBD | Schematic Block Diagram |
| ECF | Equivalency Capability File |
| OMSF | Office Of Manned Space Flight (now OSTS) |
| MFC | Multiple Flight Controller |
| CM&S | Communications Maintenance And Storage |
| ERPM | Engineering Requirements And Procedures Manual |
| CAPCOM | Capsule Communicator |
| IGOR | Intercept Ground OPtical Recorder |
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