| Acronym | Meaning |
 | WUSCI | Western Union Space Communications |
| MTEM | Mechanical Maintenance Test Equipment |
| CSOC | Consolidated Space Operations Center |
| LDIU | Launch Data Interface Unit |
| HG | Mercury |
| G | LOW Ground Lift-Off Weight |
| ICC | Intercomputer Channel |
| OC | Overcurrent |
| LCT | Launch Countdown |
| LB | Low Bay |
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