| Acronym | Meaning |
 | PRF | Pulse Repetition Frequency |
| GECALL | GCOS Program Element Name |
| MUA | Material(s) Usage Agreement |
| ESS | Effective Sunset |
| LBR | Low Bit Rate |
| IAL | Immediate Action Letter |
| OPS | Orbiter Project Schedules |
| LRV | Launch Readiness Verification |
| FSK | Frequency Shift Keyed (Keying) |
| UPP | User Parameter Processing |
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