Lieutenant Commander

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Common military ranks
Officers
Navies1	Armies and Air Forces	Air Forces1
Admiral of the Fleet	Field Marshal	Marshal of the Air Force
Admiral	General	Air Marshal
Commodore	Brigadier	Air Commodore
Captain	Colonel	Group Captain
Commander	Lt. Colonel	Wing Commander
Lt. Commander	Major	Squadron Leader
Lieutenant	Captain	Flight Lieutenant
Sub-Lieutenant	Lieutenant	Flying Officer
Seamen, soldiers and airmen
Warrant Officer	Sergeant Major	Warrant Officer
Petty Officer	Sergeant	Sergeant
Leading Rate	Corporal	Corporal
Seaman	Private	Aircraftman
1 in the Commonwealth

Lieutenant Commander (Lieutenant-Commander (Pronounced Lef-tenant) in the Royal Navy)^[1] is a commissioned officer rank in many navies superior to a Lieutenant and subordinate to a Commander. The corresponding rank in most armies, (armed services) and air forces is Major, and in the Royal Air Force and other Commonwealth air forces is Squadron Leader also.

A Lieutenant Commander is a senior department officer on a large ship or shore installation. He may also be commanding officer or executive officer (second-in-command) of a smaller ship or installation.

1 Origins 2 United Kingdom 2.1 Royal Navy 2.2 Royal Observer Corps 3 Canada 4 United States 5 Russia 6 References

Lieutenants were commonly put in command of smaller vessels not warranting a Commander or Captain: such a Lieutenant was called a "Lieutenant Commanding" or "Lieutenant Commandant" in the United States Navy, and a "Lieutenant in Command" or "Lieutenant and Commander" in the Royal Navy. The USN settled on "Lieutenant Commander" in 1862, and made it a distinct rank; the RN followed suit in March 1914.

The insignia worn by a Royal Navy Lieutenant-Commander (Lt Cdr) is two medium gold braid stripes with one thin gold stripe running in between, placed upon a navy blue/black background. The top stripe has the ubiquitous loop used in all RN officer rank insignia. The RAF follows this pattern with its equivalent rank of Squadron Leader.

Having fewer officer ranks than the army, the RN previously split some of its ranks by seniority (time in rank) to provide equivalence: hence a Lieutenant with fewer than eight years' seniority wore two stripes, and ranked with an army Captain; a Lieutenant of eight years or more wore two stripes with a thinner one in between, and ranked with a Major. This distinction was abolished when the rank of Lieutenant-Commander was introduced, the new rank taking the insignia and army equivalence of a senior Lieutenant.

Similar insignia is worn by Lieutenant-Commanders in other Commonwealth navies, such as the Royal Australian Navy (which uses the abbreviation "LCDR"), the Royal New Zealand Navy and the Canadian Forces Maritime Command (formerly the Royal Canadian Navy; which uses the abbreviation "LCdr"). Unlike the United States Navy, personnel in the Royal Navy or other Commonwealth Navies addressing a Lieutenant-Commander do not abbreviate the rank to "Commander."

v â€¢ d â€¢ e Commissioned Officer ranks of the British Armed Forces
	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	OC	Mid	SLt		Lt	Lt Cdr	Cdr	Capt	Cdre	RAdm	VAdm	Adm	Adm of the Fleet
Royal Marines			2Lt	Lt	Capt	Maj	Lt Col	Col	Brig	Maj-Gen	Lt Gen	Gen
Army	O Cdt		2Lt	Lt	Capt	Maj	Lt Col	Col	Brig	Maj-Gen	Lt Gen	Gen	FM
Royal Air Force	OC		APO / Plt Off	Fg Off	Flt Lt	Sqn Ldr	Wg Cdr	Gp Capt	Air Cdre	AVM	Air Mshl	Air Chf Mshl	MRAF

Throughout much of its existence, the British Royal Observer Corps (ROC) maintained a rank of Observer Lieutenant Commander. The ROC wore a Royal Air Force uniform and their rank insignia appeared similar to that of an RAF Squadron Leader except that the stripes were shown entirely in black. Prior to the renaming, the rank had been known as Observer Lieutenant (First Class).

Main article: Lieutenant-Commander (Canada)

Main article: Lieutenant Commander (United States)

v â€¢ d â€¢ e U.S. officer and officer candidate ranks
	Officer Candidate	O-1	O-2	O-3	O-4	O-5	O-6	O-7	O-8	O-9	O-10	Special	Special
Approximate Insignia:	(no universal insignia)												(no authorized insignia)
USAF:	CDT / OT	2d Lt	1st Lt	Capt	Maj	Lt Col	Col	Brig Gen	Maj Gen	Lt Gen	Gen	GOAF[1][4]	[2]
USA:	CDT / OC	2LT	1LT	CPT	MAJ	LTC	COL	BG	MG	LTG	GEN	GA[1][4]	General of the Armies[1][4]
USMC:	Midn / Cand	2ndLt	1stLt	Capt	Maj	LtCol	Col	BGen	MajGen	LtGen	Gen	[2]	[2]
USN:	MIDN / OC	ENS	LTJG	LT	LCDR	CDR	CAPT	CDRE[1] / RDML	RADM	VADM	ADM	FADM[1][4]	Admiral of the Navy[1][4]
USCG:	CDT	ENS	LTJG	LT	LCDR	CDR	CAPT	CDRE[1] / RDML	RADM	VADM	ADM	[2]	[2]
USPHS:	[2]	ENS	LTJG	LT	LCDR	CDR	CAPT	RDML	RADM	VADM	ADM	[2]	[2]
NOAA:	[2]	ENS	LTJG	LT	LCDR	CDR	CAPT	RDML	RADM	VADM[1][4]	[3]	[2]	[2]
Grade inactive [1] Grade never created [2] Grade is authorized for use by U.S. Code but has not been created [3] Grade requires Congressional approval for re-activation [4]

v â€¢ d â€¢ e U.S. warrant officer ranks
	W-1	W-2	W-3	W-4	W-5
Approximate Insignia:	(no universal insignia)	(no universal insignia)	(no universal insignia)	(no universal insignia)	(no universal insignia)
USAF:	WO-1[1]	CWO-2[1]	CWO-3[1]	CWO-4[1]	CWO-5[1]
USA:	WO1	CW2	CW3	CW4	CW5
USMC:	WO-1	CWO-2	CWO-3	CWO-4	CWO-5
USN:	WO-1[1]	CWO-2	CWO-3	CWO-4	CWO-5
USCG:	[3]	CWO-2	CWO-3	CWO-4	[3]
USPHS:	[3]	[3]	[3]	[3]	[2]
NOAA:	[2]	[2]	[2]	[2]	[2]
Grade inactive [1] Grade never created [2] Grade is authorized for use by U.S. Code but has not been created [3]

The corresponding rank to Lieutenant Commander is Captain 3rd Rank.