Who holds the rank of O-6?

The rank of O-6 corresponds to Captain in the military ranking system. This rank signifies a senior leadership position, typically found in both the Navy and other branches of the military, where the individual has significant responsibility for personnel, operations, and the overall mission of their unit. Captains often command large assets such as ships, squadrons, or large detachments and can influence substantial operational decisions.

In the context of military ranks, O-6 is the sixth level in the officer grade structure and is crucial for upward mobility within the officer ranks. Other ranks listed in the question fall below O-6 in hierarchy: Commander is O-5, Rear Admiral Lower Half is an O-7, and Lieutenant Commander is classified as O-4. Each of these ranks has different roles and responsibilities within the military, indicating a clear progression in rank and responsibility as one ascends through the ranks.