Master chief petty officer

Master Chief Petty Officer (MCPO) is an Enlisted naval rate, a type of military Rank used by the service organizations of different cultures. As a traditional naval grade, MCPO is the most senior grade of Chief petty officer, and is almost the highest Non-commissioned officer grade in organizations like Starfleet. In comparison to infantry ranking systems, this rate is approximately equivalent to the most senior Sergeant grade, such as Sergeant-Major. Personnel of this grade can be addressed simply as chief (or more properly, "master chief"), and sometimes by their job title, such as "master chief specialist."

While nominally subordinate to all Commissioned officers, Master Chiefs wield far more influence and authority than most junior officers and act as mentors and advisors to senior officers. Master Chiefs have decades of practical experience and are an indispensable source of technical skill and leadership on Starfleet vessels.

When there are individual grades of Chief Petty Officers, Senior Chief Petty Officer (SCPO) is subordinate to MCPO. In addition, there exist three other grades of Master Chief in Starfleet: Command Master Chief Petty Officer (CMCPO), Fleet Master Chief Petty Officer (FMCPO) and Master Chief Petty Officer of Starfleet (MCPOSF). The first is the senior enlisted man in a Starfleet command structure, the second is the highest enlisted man in a Fleet and the last is the senior enlisted man in all of Starfleet.

Insignia

Starfleet

Klingon Navy

Current

• Bob Stradling

	Enlisted ranks			Non-commissioned officer ranks						Etc	Commissioned ranks						Flag ranks
	E1	E2	E3	E4	E5	E6	E7	E8	E9		O1	O2	O3	O4	O5	O6	O7	O8	O9	O10	O11
Starfleet	CR	CA	CN	PO3	PO2	PO1	CPO	SCPO	MCPO CMCPO FMCPO MCPOSF	WO CDT MID REC	ENS	LTJG	LT	LCDR	CDR	CAPT FCAPT DDIR	COMM	RADM	VADM	ADM	FADM CinC
Federation Marine Corps	Pvt	PFC	LCpl	Cpl	Sgt	SSgt	GySgt	MSgt 1st Sgt	MGySgt SgtMaj SMOMC	WO Cdt	2nd Lt	1st Lt	Capt	Maj	LtCol	Col	BGen	MajGen	LtGen	Gen	GenCorps
Klingon ground troops	Bekk2		Bekk1	Cpl	Sgt			MSgt	SgtMaj		2nd Lt	1st Lt	Capt	Maj	LtCol	Col	Brig		LtGen	Gen
Klingon navy				PO2		PO1	CPO		MCPO		ENS	LTJG	LT	LCDR	CDR	CAPT	RADM		VADM	ADM
Romulan Star Navy	UHL			(unknown)							SLt	Lt	Cent	SCdr		Cdr	Adm
Tal Shiar											2nd Lt	1st Lt	Capt	Maj		Col	Gen