Lieutenant, junior grade

A Lieutenant, Junior Grade, is a division officer in the United States Navy. He or she leads a group of non-commissioned officers and enlisted personnel in duties in weapons, engineering, and naval specialities. A Pilot Lieutenant, Junior Grade is promoted at a later date than his or her Surface Ship or Submarine fellow, because of training time. The time for promotion to Lieutenant, Junior Grade, is two to three years after joining the Fleet, Their Army, Air Force, and Marine Corps equals are First Lieutenants

In the Royal Navy and navies of many Commonwealth countries the equivalent rank is Sub-Lieutenant

See Comparative military ranks and U.S. Navy Officer Rank Insignia

British comissioned officer ranks
	Student Officer	OF(D)	OF-1	OF-2	OF-3	OF-4	OF-5	OF-6	OF-7	OF-8	OF-9	OF-10
Royal Navy:	OCdt	Mid	SLt	Lt	Lt Cdr	Cdr	Capt	Cdre	RAdm	VAdm	Adm	Admiral of the Fleet
Royal Marines:	OCdt		2Lt - Lt	Capt	Maj	Lt Col	Col	Brig	Maj Gen
Army:	OCdt	OD	2Lt - Lt	Capt	Maj	Lt Col	Col	Brig	Maj Gen	Lt Gen	Gen	FM
Royal Air Force:	OCdt	OD	PO - FO	Flt Lt	Sqn Ldr	Wg Cdr	Gp Capt	ACdre	AVM	AM	ACM	MRAF