| Acronym | Meaning |
 | PFRX | Preflight Relmat (X- 1 |
| LLP | Launch And Landing Project |
| HD | Hydrogen Drain |
| TA | Test Article |
| SPR | Subcontractor Performance Review |
| ELV | Electrically Operated Valve |
| TPF | Terminal Phase Finalization (Braking) |
| ESMC | Eastern Space And Missile Center (formerly AFETR) |
| PPS | Pulse Per Second |
| DV | Designee For Verification |
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