Lieutenant junior grade

Lieutenant junior grade (also called junior lieutenant, lieutenant j.g., or just j.g.) is a military rank used in Federation Starfleet from the 2280s through the 24th century, immediately superior to ensign and immediately subordinate to lieutenant. The corresponding rank in the marines is first lieutenant. Officers with rank lieutenant j.g. are addressed as 'lieutenant'.

History

The term comes from the United States Navy of the 20th century. The USN abbreviation was LTJG.

The corresponding term in Commonwealth navies, including the Royal Navy of Britain, was sub-lieutenant. The RN has no equivalent of ensign, so sub-lieutenant was the most junior officer rank.

The Earth Starfleet of the 22nd century may not have had this rank, so that the rank immediately below lieutenant was ensign.

The costume department for ENT did not have an insignia for it, so it never appeared on screen.

In the 2260s a single broken sleeve stripe was used as the insignia for junior lieutenants.

This only appeared on screen once. Characters without sleeve stripes were variously addressed as 'crewman', 'ensign', or 'lieutenant'. Can we interpret the last as having recently been promoted to lieutenant j.g. but not got around to upgrading their uniform?

In the 2270s this was instead used to mean ensign, and there was no lieutenant j.g. rank. (Star Trek: The Motion Picture)

From the 2280s the lieutenant j.g. rank had a distinctive rank pin.

Starfleet insignia

22nd century	2230s

2240s-2250s	2250s	2260s-2270s	Early 2270s (Shoulders/Sleeves)	Late 2270s-2350s (Shoulders/Sleeves)
			N/A

2350s-2360s	2360s-2370s service uniform	2360s-2370s duty uniform	2370s-2380s

Early 2380s	Mid 2380s	2390s
File:LTJG (early 2380s).png File:Red (early 2380s).png	File:LTJG (mid 2380s).png File:Red (mid 2380s).png	File:LTJG (2390s).png File:Red (2390s).png

Alternate realities

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

Non-Starfleet insignia

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		2nd Lt	1st Lt	Capt (HoH)	Maj	LtCol	Col	Brig ('ech)		LtGen	Gen (Sa')
			PO2	PO1	CPO	MCPO		ENS	LTJG	LT (Sogh)	LCDR	CDR (la')	CAPT (HoD)	CDRE (totlh)		VADM	ADM
Lyran ranks		CR CN	PO2 PO1	CPO	SCPO	MCPO	CDT	ENS	LTJG	LT	LCDR	CDR	CAPT FCAPT	CDRE	SCDRE	VADM	COUNT	DUKE KING

External links

• Lieutenant junior grade article at Memory Alpha, the canon Star Trek wiki.
• Lieutenant junior grade article at Memory Beta, the non-canon Star Trek wiki.
• Lieutenant junior grade article at Wikipedia, the free encyclopedia.