The term NAVAL OFF. refers to the various ranks of officers in the United States Navy. The ranks, from lowest to highest, are Ensign (ENS), Admiral (ADM), Commander (CDR), Commodore (COM), Chief Petty Officer (CPO), Captain (CPT), Boatswain (BOSN), Commander (CMDR), Lieutenant Junior Grade (LTJG), and Rear Admiral (RADM). Each rank has its own responsibilities and duties, and each is a step up from the one before it.