| Acronym | Meaning |
 | PVS | Periscope View Simulators (associated With 21a Series) |
| RALT | Radar Altitude |
| SSBN | Submarine Ballistic Nuclear |
| PDP | Program Definition Phase |
| FTAM | File Transfer Access And Management |
| INAV | Inertial Navigation |
| OCD | Operational Concept Document |
| TMCR | Technical Manual Contract Requirement |
| DC | Data Collection |
| O&SHA | Operating And Support Hazard Analysis |
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