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First Lieutenant is a military rank.

The rank of Lieutenant has different meanings in different military formations (see comparative military ranks), but in all cases it is common for it to be divided.

In the United States Army, Air Force and Marine Corps, First Lieutenant is the second-lowest ranking commissioned officer. It is one step above the rank of Second Lieutenant. In the British Army and Royal Marines, the rank is only Lieutenant, with no ordinal attached.

In the Royal Navy, the rank of Lieutenant is equivalent to that of a Captain in the army. First Lieutenant is not a specific rank, but aboard a ship, one officer would be designated as First Lieutenant (familiarly, "Number One") and would be the effective second in command. This is still the case, although the First Lieutenant often now holds the rank of Lieutenant Commander. In smaller ships he also holds the position of Executive Officer, although in larger ships he is the XO's deputy.

In the United States Navy, First Lieutenant is a position title and is held by the officer in command of the Deck Department. On smaller ships, a First Lieutenant holds the rank of Lieutenant Junior Grade. On larger vessels, the position is held by a Lieutenant or, in the case of extremely large warships such as aircraft carrierUSS John C. Stennis (left), and HMS Illustrious (right), showing the difference in size between a supercarrier and a typical aircraft carrier. An aircraft carrier is a warship whose main role is to deploy and recover aircraft. Aircraft carriers thus allows, a Lieutenant Commander or even full CommanderCommander is a military rank used in many navies but not generally in armies or air forces. It is below Captain and above Lieutenant-Commander. Formerly the rank was Master and Commander . A Commander in the U. Navy commands a Frigate, Destroyer, Submarin.

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

Lieutenant 1 U.S. military officer ranks



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