| Acronym | Meaning |
 | RTC | Recruit Training Command |
| PVS | Periscope View Simulators (associated With 21a Series) |
| PDS | Program Design Spec Udi-e-21268b/mod |
| PSTAT | Precipitation Static |
| SSTD | Surface Ship Torpedo Decoy |
| EOUTR | Engine Out Right Engine |
| VSC | Vast System Change (tdc 85) |
| AG | Miscellaneous Auiliary Ship |
| PSI | Pounds Per Square Inch |
| CCA | Carrier Controlled Approach |
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