Chief petty officer

The rating of Chief petty officer was the highest enlisted rating in Starfleet. The chief petty officer, invariably referred to as chief, was a senior non-commissioned officer and is often in control of an entire section of petty officers and unrated enlisted personnel.

The term "chief petty officer" is deduced from real-world naval nomenclature; it is not used in canon Trek, only the word "chief".

Chiefs are further subdivided into a series of ranks based on seniority and merit. These ranks, from lower to higher are as follows: chief, senior chief, and master chief.

While chiefs are subordinate to all commissioned officers, intelligent ensigns or lieutenants will listen to their chiefs, as these non-commissioned officers frequently have far greater experience than the junior officers under whom they serve. Even senior officers recognize the value of a good chief petty officer and will take their suggestions and advice seriously.

Insignia

Starfleet

Klingon Navy

Current

• CPO Jamar Tambu

	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