Lieutenant

Lieutenant (Lt) is a common military officer rank. In some forces it is called First Lieutenant (1st Lt) or Senior Lieutenant, to distinguish it from the subordinate Second Lieutenant or Sub-Lieutenant.

The senior grade of Lieutenant is known as First Lieutenant in the United States, and as Lieutenant in the United Kingdom and the rest of the English-speaking world. In US English it is pronounced "loo-ten-ant", and in British English "leff-ten-ant".

In the British Army and Royal Marines, the rank above Second Lieutenant is simply Lieutenant (OF-1), with no ordinal attached.

In the Royal Navy, the rank of Lieutenant is OF-2, equivalent to that of a Captain in the army. The term First Lieutenant is a post (specific role) undertaken by a Lieutenant, rather than a separate rank.