Lieutenant Commander

Lieutenant Commander was a military rank found in the Navy.

In Imperial Service
In the Imperial Navy, a Lieutenant Commander was a command-level rank located in between Lieutenant and Commander. They had demonstrated further tactical thinking and command ability than Lieutenants, and were given certain levels of authority in the Navy.

On a ship the size of a Star Destroyer, a Lieutenant Commander commanded a certain section of the ship or act as an assistant to a Commander or Captain. On smaller scale vessels, a Lieutenant Commander could act as Executive Officer, or even Commanding Officer, if the situation called for it.

In the Imperial Starfighter Corps, a Lieutenant Commander generally commanded a squadron and was known as Squadron Leader. If a squadron had more than one Lieutenant Commander, one would be appointed Squadron Leader and the other Executive Officer.