| Acronym | Meaning |
| DMA | Defense Mapping Agency |
| STEP | Standard For Exchange Of Product Model Data |
| CSTIRS | C School Training Input Requirements System |
| CRN | Crown |
| BIC | Bus Interface Controller |
| PMCS | Partial Mission Capable, Supply |
| MIS | Management Information System |
| ESC | Executive Steering Committee |
| PVS | Periscope View Simulators (associated With 21a Series) |
| SIMAS | Sonar In-situ Mode Assessment |