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 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 carriers, a Lieutenant Commander or even full Commander.
He joined the 1st Border in 1933 and qualified as a signaller, which proved to be his occupation for most of his military career.
Lieutenant HARDY immediately assumed duties as Second in Command of the Company, and under intense mortar and machine-gun fire he toured the Company area encouraging the men to greater efforts.
On the night of the withdrawal, Lieutenant Hardy was at Divisional HQ and ordered to set free the last of the carrier pigeons which had been brought in with the Division.
In the Royal Navy, the rank of Lieutenant is equivalent to that of a Captain in the army, and First Lieutenant is a position rather than a rank.
In the United States Navy, First Lieutenant is a position title and is held by the officer in command of the Deck department.
On larger vessels, the position is held by a Lieutenant or, in the case of extremely large warships such as aircraft carriers, a LieutenantCommander or even full Commander.