| Acronym | Meaning |
 | COMPASS | Computer Alerted Surveillance System |
| FMP | Fleet Modernization Program |
| TACDEW | Tactical Advanced Combat Direction & Electronic Warfare |
| ATC | Air Traffic Control |
| J&A | Justification & Approval |
| ARDM | Medium Auxiliary Repair Dry Dock (non Self-propelled) |
| FFRDC | Federally Funded Research & Development Center |
| MIDAS | Mine Detection And Avoidance Sonar |
| PVS | Periscope View Simulators (associated With 21a Series) |
| SMTP | Simple Mail Transfer Protocol |
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