| Acronym | Meaning |
 | GRE | Gamma Ray Explorer |
| GORS | GrGORSGround Observer RF System |
| S | Second |
| QEC | Quick Engine Change |
| SCF | Spacecraft Control Facility |
| PMF | Program Management Facility |
| BASD | Ball Aerospace Systems Division |
| G&NS | Guidance And Navigation Subsystem |
| ECCB | Engineering Change Control Board |
| IUS | Inertial UPper Stage (was Interim UPper Stage) |
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