| Acronym | Meaning |
 | R | LSS Regenerative Life Support System |
| SEC | Sequential Events Controller |
| DFS | Directional Finding System |
| GHZ | Gigahertz |
| FOF | Flight Operations Facilities |
| SCM | System Control Module |
| UDOP | Ultrahigh Doppler |
| ED | Edge Distance |
| SSAT | SPace Shuttle Access Tower (now FSS) |
| SE | Support EquiPment |
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