| Acronym | Meaning |
 | RCHCS | Regenerable CO And Humidity Contro SYstem |
| PP | Partial Pressure |
| GN | GaGN Gain |
| OP | Oxygen Purge |
| INTRG | Interrogate |
| FSSR | Flight Systems Software Requirements |
| TO | Operations Management (KSC Directorate) |
| SEE | Special Purpose End Effector |
| PM | Power Management And Distribution |
| TACAN | Tactical Air Navigation |
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