| Abbreviation | Definition |
|---|---|
| BLKS3 | Blacksmith Third Class |
| BLKSA1 | Blacksmith (aviation) First Class |
| BLKSA2 | Blacksmith (aviation) Petty Officer 2nd Class |
| BLKSA3 | Blacksmith (aviation) Third Class |
| BLKSAW1 | Blacksmith (aviation-welder) First Class |
| BLKSAW2 | Blacksmith (aviation-welder) Second Class |
| BLKSAW3 | Blacksmith (aviation-welder) Third Class |
| BLKSML | Blacksmith (striking For Molder) |
| BLKSMTH | Blacksmith |
| BM | Boatswain's Mate |
| BM1 | Boatswain's Mate 1st Class |
| BM1 | Boatswain's Mate Petty Officer 1st Class |
| BM2 | Boatswain's Mate 2nd Class |
| BM2 | Boatswain's Mate Petty Officer 2nd Class |
| BM3 | Boatswain's Mate 3rd Class |
| BM3 | Boatswain's Mate Petty Officer 3rd Class |
| BMA1 | Boatswain's Mate (Master-at-Arms) 1st Class |
| BMA1 | Boatswain's Mate (master-at-arms) Petty Officer 1st Class |
| BMA2 | Boatswain's Mate (Master-at-Arms) 2nd Class |
| BMA2 | Boatswain's Mate (master-at-arms) Petty Officer 2nd Class |