[b]Enlisted[/b] E-0: Crewman Recruit - CR  E-1: Crewman Apprentice - CA  E-2: Crewman - CRW  E-3: Petty Officer Third Class - PO3  E-4: Petty Officer Second Class - PO2  [b]Non Commissioned Officers[/b] E-5: Petty Officer First Class - PO1  E-6: Chief Petty Officer - CPO E-7: Senior Chief Petty Officer - SCPO E-8: Master Chief Petty Officer - MCPO  [b]Warrant Officers[/b] OT: Cadet - CDT  WO-1: Warrant Officer - WO  WO-2: Chief Warrant Officer - CWO [b]Commissioned Officers[/b] O-1: Ensign - ENS O-2: Lieutenant Junior Grade - LTJG O-3: Lieutenant - LT O-4: Lieutenant Commander - LCDR  O-5: Commander - CDR  O-6: Captain - CPT