| Abbreviation | Definition |
|---|---|
| CQM | ief Quartermaster (chief Petty Officer) |
| CR | Construction Recruit |
| CR | nstruction Recruit |
| CRDM | Chief Radarman |
| CRDM | ief Radarman |
| CRM | Chief Radioman |
| CRM | ief Radioman |
| CRT | Chief Radio Technician |
| CRT | ief Radio Technician |
| CRYPTOTECH | Chief Cryptologic Technician |
| CRYPTOTECH | ief Cryptologic Technician |
| CS1 | Commissaryman Petty Officer 1st Class |
| CS1 | mmissaryman Petty Officer 1st Class |
| CS2 | Commissaryman Petty Officer 2nd Class |
| CS2 | mmissaryman Petty Officer 2nd Class |
| CS3 | Commissaryman Petty Officer 3rd Class |
| CS3 | mmissaryman Petty Officer 3rd Class |
| CSAD | Chief Special Artificer (special Devices) |
| CSAD | ief Special Artificer (special Devices) |
| CSAI | Chief Special Artificer (instruments) |