| Acronym | Meaning |
 | ORTHOG | Orthogonal |
| MTFO | Modular Training Field Option |
| MGC | Manual Gain Control |
| GD | Guard |
| VI | Internal Velocity |
| PIIN | Procurement Instrument Identification Number |
| SIA | Solar Inertial Attitude |
| TTA | Thermomechanical Test Area |
| CTI | Critical Transportation Item |
| CQD | R Critical Qualification Design Review |
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