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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 Edit

StarfleetEdit

2373 - MCPO (Command) 2373 - MCPO (Operations) 2373 - MCPO (Sciences)


Klingon NavyEdit

Klingon Navy - MCPO

Current Edit



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

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