| Acronym | Meaning |
 | LEM | Lunar Excursion Module |
| ISO | Infrared Space Observatory |
| BMDO | Ballistic Missile Defense Office |
| ASI | Agenzia Spaziale Italiano |
| SAGA | Solar Array Gain Augmentation |
| OMS | Orbital Maneuvering System |
| ERBE | Earth Radiation Budget Experiment |
| HB | Horizontal Branch |
| LHA | Local Hour Angle |
| MTC | Man Tended Capability |
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