| Acronym | Meaning |
 | GCO | Ground Checkout |
| RC | Recurring Cost |
| VPF | Vertical Processing Facility |
| PS | Prime Select |
| OPA | Operations Planning Analysis |
| FFC | Final Flight Certification |
| NNI-I | NASA Standard Initiator-Type I (was SMSI) |
| PCIN | Program Change Identification Number |
| RDF | Resource Data File |
| FM/PM | Frequency Modulation/Phase Modulation |
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