| Acronym | Meaning |
| MTMS | Model 901 Test And Maintenance Software |
| RRR | Requirements Rational Report |
| NRZ | Non-return-to-zero |
| PPBIT | Pre-periodic Built-in Test |
| HCP | Hardness Critical Process |
| WX | Weather |
| VFR | Visual Flight Rules |
| IGNRQ | Ignition Request |
| FOD | Field Operations Division |
| ATC | Mini-armored Troop Carrier (river/roadstead Craft) |