Which rank corresponds to the O-3 designation?

The rank that corresponds to the O-3 designation is Captain. In the context of military ranks, specifically within the U.S. Armed Forces, the O-3 pay grade indicates the rank of Captain in the Army, Air Force, and Marine Corps, while in the Navy, the equivalent rank for O-3 is actually Lieutenant.

While Lieutenant is a military rank that exists in several branches, it specifically refers to O-2 in the context of the Navy and O-3 in the context of the Army. Therefore, the designation O-3 is correctly aligned with Captain within the Army, Air Force, and Marine Corps, as these branches classify Captain at the O-3 level.

Understanding military rank designations is important in recognizing the structure and hierarchy within the forces, which plays a crucial role in command and leadership. Each branch may have variations in titles and roles; thus, knowing these correlations helps in comprehending the overall ranking system effectively.