| Acronym | Meaning |
| FAP | Freedom Attached Payloads |
| SSRMS | Space Station Remote Manipulator System |
| DRSS | DATA Relay Satellite System |
| AFETR | USAF's ETR |
| AXAF | Advanced X-ray Astrophysics Facility |
| GPPF | Gravitational Plant Physiology Facility |
| ATDRS | Advanced Tracking And Data Relay Satellite |
| HRDI | High Resolution Doppler Imager |
| ISO | Imaging Spectrometic Observatory |
| ET | Ephemeris Time |