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Petty officer second class is the fifth enlisted rank in Starfleet, just above petty officer third class and below petty officer first class, and is a non-commissioned officer.

In the Lyran Starfleet, a petty officer second class is simply referred to as a petty officer. (RIS Bouteina)

Starfleet insigniaEdit

22nd century	2230s

2250s	2265-2270s	Early 2270s	Late 2270s-2350s

2350s-2360s	2360s-2370s service uniform^[1]	2360s-2370s duty uniform^[1]	2373-

2250s	2380s-2400s	2390s	29^th century

Klingon Navy	Lyran Starfleet

	Enlisted ranks					Etc	Officer ranks						Flag ranks
Starfleet Officers Enlisted Misc.	CR CA CN	PO3 PO2 PO1	CPO	SCPO	MCPO CMCPO FMCPO MCPOSF	WO CDT MID REC	ENS	LTJG	LT	LCDR	CDR	CAPT FCAPT	CDRE RDML RADM		VADM	ADM	FADM
Klingon Defense Force (Ground forces & navy)	Bekk	Cpl	Sgt	MSgt	SgtMaj		2^nd Lt	1^st Lt	Capt (HoH)	Maj	LtCol	Col	Brig ('ech)		LtGen	Gen (Sa')
Klingon Defense Force (Ground forces & navy)	Bekk	PO2	PO1	CPO	MCPO		ENS	LTJG	LT (Sogh)	LCDR	CDR (la')	CAPT (HoD)	CDRE (totlh)		VADM	ADM
Kai Imperium	TRN MNX IMUN	LGN3 LGN2 LGN1	CLGN	CEN	SCEN		PVT	PRN		OP	TRB VIC	PR	PTR		MST	LEG	IMP
Kellarian System Defense Force (Navy & Ground forces)	CR CN	PO2 PO1	CPO	SCPO	MCPO		ENS	SLT	LT	SCDR	CDR	CAPT	CDRE	VADM		ADM	FADM
Kellarian System Defense Force (Navy & Ground forces)	PVT PFC	CPL SGT	SSG	MSG	SGM		3LT	2LT	1LT	MAJ	LTCOL	COL	MGEN	LGEN		GEN	CGEN
Lyran ranks	CR CN	PO2 PO1	CPO	SCPO	MCPO	CDT	ENS	LTJG	LT	LCDR	CDR	CAPT FCAPT	CDRE	SCDRE	VADM	COUNT	DUKE KING
So'ja High Command	REC CN PVT	PO3 PO2 PO1	CPO	MC			CPL	SGT	LT	MAJ	LTCOL	COL	ADM			MADM	SADM

↑ ^1.0 ^1.1 Up until the introduction of specialized insignia in 2372, crewmen and petty officers wore no insignia.

Petty officer second class article at Wikipedia, the free encyclopedia.