| Acronym | Meaning |
 | FM | Flight Model |
| IPS | IRAR Internal Variable |
| SAMSO | Space And Missile SYstems Organization (USAF) |
| MGE | Maintenance Ground Equipment |
| OBC | Onboard Computer |
| P&M | Processes And Materials |
| HXIS | Hard X-ray Imaging Spectrometer |
| OMPT | Observed Mass Point Trajectory |
| DY | Deputy Director (KSC Directorate) |
| MZFW | MMZFWMaximum Zero Fuel Weight |
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