Which title corresponds to a Lieutenant Commander?

A Lieutenant Commander is designated as an O-4 in the military rank structure. The "O" refers to the officer ranks, and the numbers correspond to the levels of those ranks. Specifically, O-4 is the fourth tier of commissioned officers, which includes the rank of Lieutenant Commander in the Navy and Coast Guard.

The rank structure is carefully defined; for instance, O-3 is a Lieutenant, and O-2 is a Lieutenant Junior Grade, both of which are lower than O-4. O-5 corresponds to the rank of Commander, which is one step higher than Lieutenant Commander. Understanding this hierarchy is essential for navigating military structures, promotions, and leadership roles within the armed services.