Master Chief Petty Officer of the Navy

From Halopedia, the Halo Wiki

[1] Master Chief Petty Officer of the Navy Affiliation UNSC Navy Higher Rank Ensign Lower Rank Command Master Chief Petty Officer Known Master Chief Petty Officer of the Navys John-117 (2553)
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Master Chief Petty Officer of the Navy is a billet position of the UNSC Navy. It is equal in rank to Sergeant Major of the Marine Corps, Sergeant Major of the Army, and Chief Master Sergeant of the Air Force. In informal settings, Master Chief Petty Officers are typically called "Master Chief".

The Master Chief Petty Officer of the Navy is selected by the Navy Chief of Staff. The MCPON is the senior enlisted member in the Navy, with a 3-star protocol equivalency. The MCPON represents the entire Navy enlisted force, and speaks on behalf of the enlisted members of the service to Navy and UNSCDF senior leadership.

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1. ↑ This insignia can be seen attached to the memorial in the final cutscene for the level "Halo" in Halo 3.

UNSC Defense Force enlisted ranks
	E-1	E-2	E-3	E-4	E-5	E-6	E-7	E-8	E-9	Senior Enlisted Advisor
Air Force:	AB	Amn	A1C	SrA	SSgt	TSgt	MSgt	SMSgt	CMSgt - CCM	CMSAF
Army:	PV1	PV2	PFC	SPC - CPL	SGT	SSG	SFC	MSG - 1SG	SGM - CSM	SMA
Marine Corps:	Pvt	PFC	LCpl	Cpl	Sgt	SSgt	GySgt	MSgt - 1stSgt	MGySgt - SgtMaj	SgtMajMC
Navy:	CR	CA	CN	PO3	PO2	PO1	CPO	SCPO	MCPO - CMDCM - FORCM - FLTCM	MCPON