Commander

Commander is a military rank used in Earth Starfleet and Federation Starfleet, superior to lieutenant and lieutenant commander and subordinate to captain. A commander may be a department head, aide-de-camp or executive officer on a large vessel or starbase, or may be commanding officer or first officer of a smaller vessel.

Following naval tradition, the commanding officer of a vessel is addressed as "captain" while on their own vessel, regardless of rank. (DS9: "Behind the Lines")

The rank is equivalent to the Marines rank of lieutenant colonel, and the Romulan and pre-Federation Vulcan rank of subcommander (they used "commander" to mean their equivalent of the Starfleet rank captain).

Insignia[]

Starfleet[]

Klingon Navy[]

Romulan Star Navy[]

Current[]

	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 1^st Sgt	MGySgt SgtMaj SMOMC	WO Cdt	2^nd Lt	1^st Lt	Capt	Maj	LtCol	Col	BGen	MajGen	LtGen	Gen	GenCorps
Klingon ground troops	Bekk2		Bekk1	Cpl	Sgt			MSgt	SgtMaj		2^nd Lt	1^st Lt	Capt	Maj	LtCol	Col	Brig		LtGen	Gen
Klingon navy	Bekk2		Bekk1	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	UHL			(unknown)							2^nd Lt	1^st Lt	Capt	Maj		Col	Gen