| Abbreviation | Definition |
|---|---|
| FCS3 | Fire Controlman (submarine) Petty Officer 3rd Class |
| FCS3 | Fire Controlman (surface Weapons) Petty Officer Third Class |
| FCS3 | re Controlman (surface Weapons) Petty Officer Third Class |
| FCSA | Fire Control Technician Seaman Apprentice |
| FCSA | re Control Technician Seaman Apprentice |
| FCSC | Fire Controlman (surface Weapons) Chief Petty Officer |
| FCSC | re Controlman (surface Weapons) Chief Petty Officer |
| FCSN | Fire Control Technician Seaman |
| FCSN | re Control Technician Seaman |
| FCSR | Fire Control Technician Seaman Recruit |
| FCSR | re Control Technician Seaman Recruit |
| FCSSA | Fire Controlman (surface) Seaman Apprentice |
| FCSSA | re Controlman (surface) Seaman Apprentice |
| FCSSN | Fire Controlman (surface) Seaman |
| FCSSN | re Controlman (surface) Seaman |
| FCSSR | Fire Controlman ((surface)) Seaman Recruit |
| FCSSR | re Controlman ((surface)) Seaman Recruit |
| FCT | Fire Control Technician |
| FCT | re Control Technician |
| FCU1 | Fire Controlman (underwater Weapons) |