Master chief petty officer

Master chief petty officer (MCPO) is an enlisted rank in Starfleet, above a senior chief petty officer. It is the highest enlisted rank in Starfleet.

Command division MCPO embroidery, circa 2260s.

In the 2260s, a Starfleet master chief would wear an embroidered uniform rank insignia of an enclosed chief's chevron insignia with three stripes beneath it, below the assignment patch on certain Starfleet uniforms. (FASA RPG module: Cadet's Orientation Sourcebook)

While the FASA RPG manual showed a variety of enlisted insignia, none were ever used in a canon or licensed TOS-era production or publication.

By the 2280s, a master chief wore an insignia pin in normal unform wear, a silver ring with an enlarged upper segment and a gold diamond within. A lower grade, MCPO second class, had a similar insignia, of the ring and diamond without the upper segment. (ST reference: The Star Trek Encyclopedia)

Positions and lists

Federation Starfleet

• Janice Rand
• Miles O'Brien (First Splinter timeline)
• Mike Ilucci
• Razka

Chronology

Dates listed are first appearance or mention at that rank except as noted. Personnel are Starfleet except as noted.

2379

• Razka (TNG novel: A Time to Kill)

Connections

• Master chief petty officer article at Memory Alpha, the wiki for canon Star Trek.

	Enlisted ranks				Commissioned ranks							Flag ranks
Earth SF	CREW	PO2 PO1		CPO SCPO MCPO	ENS	LT		CMDR		CAPT FCAPT VICE CDORE		CDORE	RADM / 2ADM	VADM / 3ADM	4ADM	FADM / 5ADM GADM
Starfleet & SFMC					ENS JG ENS ENS 1C	LT JG	LT	LT CMDR	CDR			CDORE 1ADM
	PVT	CPL	SGT MASTER SGT		SUBLT 2ND LT	1ST LT	CAPT	MAJOR	LT COL	COL		BRIG	GEN