| Acronym | Meaning |
 | MTEM | Maintenance Test Equipment Module |
| MT | Magnetic Tape |
| ROS | Regulated Oxygen SYstem |
| CSD | LCharles Stark Draper Laboratory (MIT) |
| OA | Office Of Applications (now OSTA) |
| DE | Design Engineering (KSC Dir.) |
| FA | Failure Analysis |
| IPB | Illuminated Push Button |
| FSS | Flight Support System |
| SHAG | Simplified High Accuracy Guidance (Honeywell) |
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