| Acronym | Meaning |
 | TSCO | Test Support Coordination Office |
| HPFTP | High Pressure Fuel Turbopump |
| VI | Internal Velocity |
| PPS | Pneumatic Power Subsystem |
| EFTO | Encrypted For Transmission Only |
| MO | Manned Orbiter |
| DFVLR | Deutsche Forschungs-und Versuchsanstalt Luft-u |
| IDR | IntermediateDesignReview |
| ENG | Engine |
| TFS | Telemetry Format Selection |
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