| Acronym | Meaning |
| GEM | Graphite Epoxy Motor |
| OCST | Office Of Commercial Space Transportation |
| IUS | Inertial Upper Stage |
| DIRBE | Diffuse Infrared Background Experiment |
| WIMP | Weakly Interacting Massive Particle |
| IGBP | International Geosphere/Biosphere Programme |
| ASE | Advanced Space Engine |
| RME | Radiation Monitoring Experiment |
| IVT | Interface Verification Test |
| OSSE | Oriented Scintillation Spectrometer Experiment |