What rank is indicated by the O-3 designation?

The O-3 designation corresponds to the rank of Lieutenant in the U.S. Navy and Coast Guard. This rank is the third level of commissioned officer ranks, following O-2, which is Lieutenant Junior Grade, and preceding O-4, which is Commander.

Lieutenants typically serve in various roles, including department heads on ships or in shore assignments, where they supervise and manage both personnel and mission-oriented tasks. Understanding this rank is vital for navigating the hierarchy and responsibilities assigned within naval operations.

The distinction between ranks is important in military structure, as each level carries different responsibilities, authority, and expectations. As a Lieutenant, the officer is expected to demonstrate leadership skills and have a thorough understanding of operations and crew management, which is essential for successful mission execution.