What rank is assigned to O-6 in the Navy?

The rank assigned to O-6 in the Navy is Captain. In naval terminology, the rank of Captain is a senior officer rank, which is equivalent to a Colonel in the Army, Air Force, or Marine Corps. At this rank, an officer typically holds significant command responsibilities, often commanding a large naval vessel, shore installation, or other substantial unit.

Understanding the rank structure is crucial not only for those serving in the Navy but also for those engaged with or observing naval operations, as it helps to clarify the chain of command and the level of authority held by individuals within the rank. The other ranks listed, such as Commander, Rear Admiral, and Vice Admiral, correspond to different pay grades and responsibilities within the naval hierarchy: Commander is O-5, Rear Admiral is O-7, and Vice Admiral is O-9, thus solidifying Captain as the correct designation for O-6.