Master Chief Petty Officer

Master Chief Petty Officer (MCPO) is an E-9 rank of the UNSC Navy, and is a non-commissioned officer. It is equal in rank to Master Gunnery Sergeant in the UNSC Marine Corps, Sergeant Major in the UNSC Army, and Chief Master Sergeant in the UNSC Air Force. Master Chief Petty Officer ranks just above Senior Chief Petty Officer.
==Sources==
Category:UNSC Enlisted Ranks
Category:UNSC Navy Ranks