| Acronym | Meaning |
| YFN | Covered Lighter (non Self-propelled) |
| TQE2 | Tqe Right |
| PME | Precision Measurement Equipment |
| OPS/CHK | Operational Checkout |
| OR | Operational Requirement |
| PDD | Program Description Document Udi-e-21251a/mod |
| MDTUM | Mean Down Time For Unscheduled Maintenance |
| QDMML | Qdmm Left |
| CCS | Change Commitment Summary |
| DTRC | David Taylor Research Center |