| Acronym | Meaning |
 | MAF | Mixed Amine Fuel |
| DCC | Digital Communications And Control Unit |
| NPN | NASA Part Number |
| OS | OPtics Subsystem |
| LASV | Low Altitude Supersonic Vehicle |
| ET | External Tank |
| IUS | Inertial UPper Stage (was Interim UPper Stage) |
| DDTS | Dynamic Docking Test System |
| COMP | Computer |
| FCEI | Facility Contractor End Item |
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