| Acronym | Meaning |
 | SCA | Shuttle Carrier Aircraft |
| GSFC | Goddard Space Flight Center |
| FAP | Freedom Attached Payloads |
| OPF | Orbiter Processing Facility |
| NACA | National Advisory Committee On Aeronautics |
| BFS | Backup Flight System |
| LTP | Lunar Transient Phenomenon |
| ENAP | Energetic Neutral Atom Precipitation |
| OGO | Orbiting Geosurvey Observatories |
| GRO | Gamma Ray Observatory |
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