| Abbreviation | Definition |
|---|---|
| FPPFR | Pipefitter (plumber) Fireman Recruit |
| FPS1 | pefitter (steamfitter) Petty Officer 1st Class |
| FPS1 | Pipefitter (steamfitter) Petty Officer 1st Class |
| FPS2 | pefitter (steamfitter) Petty Officer 2nd Class |
| FPS2 | Pipefitter (steamfitter) Petty Officer 2nd Class |
| FPS3 | pefitter (steamfitter) Petty Officer 3rd Class |
| FPS3 | Pipefitter (steamfitter) Petty Officer 3rd Class |
| FPSC | pefitter (steamfitter) Chief Petty Officer |
| FPSC | Pipefitter (steamfitter) Chief Petty Officer |
| FPSFA | pefitter (steamfitter) Fireman Apprentice |
| FPSFA | Pipefitter (steamfitter) Fireman Apprentice |
| FPSFN | pefitter (steamfitter) Fireman |
| FPSFN | Pipefitter (steamfitter) Fireman |
| FPSFR | pefitter (steamfitter) Fireman Recruit |
| FPSFR | Pipefitter (steamfitter) Fireman Recruit |
| FR | Fireman Recruit |
| FR | reman Recruit |
| FT1 | Fire Control Technician Petty Officer 1st Class |
| FT1 | re Control Technician Petty Officer 1st Class |
| FT2 | Fire Control Technician Petty Officer 2nd Class |