lieutenant commander 
noun
A rank of officer in the navy, above lieutenant and below commander.In July 1937, Rickover was promoted to the rank of lieutenant commander and became the commander of the minesweeper, Finch, an old ship well past its prime....
- Court documents allege he was illegally switched from a reservist lieutenant commander to an active-duty commander following the school scandal.
- She served fourteen years as a naval aviator before leaving the service in 1997 as a lieutenant commander.