Master chief petty officer
From Halopedia, the Halo wiki
Template:Ratings Template:Rank Infobox Master Chief Petty Officer is the ninth enlisted rank of the UNSC Navy, and is a non-commissioned officer. It is equal in rank to Master Gunnery Sergeant and Sergeant Major in the UNSC Marine Corps. Master Chief Petty Officer ranks just above Senior Chief Petty Officer.
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