Medical Ranking Equivalencies

Enlisted
Recruit - Cadet (CDT.)
Private  - Crewman Recruit (CR)
Private First Class - Crewman Apprentice (CA)
Lance Corporal -  Crewman (CN)

NCO
Corporal - Petty Officer Third Class (PO3)
Sergeant - Petty Officer Second Class (PO2)
Staff Sergeant - Petty Officer First Class (PO1)
Gunnery Sergeant - Chief Petty Officer (CPO)
Master Sergeant - Senior Chief Petty Officer (SCPO)
First Sergeant - Master Chief Petty Officer (MCPO)

Officer
Second Lieutenant - Ensign (ENS)
First Lieutenant - Lieutenant Junior Grade (LTJG)
Captain - Lieutenant (LT)