| Acronym | Meaning |
 | OL | Operational Left DSC Or MDM |
| DDS | Documentation Distribution System |
| PWBS | Program Work Breakdown Structure |
| GD | Guard |
| EPR | Engine Pressure Ratio |
| LINJET | Liquid Injection Electric Thruster |
| HVAC | Heating, Ventilating, Air-conditioning |
| RHS | Rocketdyne Hybrid Simulator |
| ABHRS | As Built Hardware Reporting System |
| EFTO | Encrypted For Transmission Only |
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