Which rank corresponds to the abbreviation O-11?

The abbreviation O-11 corresponds to the rank of Fleet Admiral in the United States Navy. This rank is unique and is only awarded in exceptional circumstances, often during or immediately after major conflicts. The title of Fleet Admiral signifies a rank above that of Admiral, which is O-10. Fleet Admirals possess broad command authority and strategic oversight, making them the highest operational rank in the Navy.

The use of the abbreviation O-11 specifically designates the highest level in the officer rank structure, while the other ranks—Vice Admiral, Admiral, and Rear Admiral—have lower respective officer codes (O-9 for Vice Admiral, O-10 for Admiral, and O-7 for Rear Admiral). Understanding this distinction is essential for recognizing the command hierarchy and roles within naval operations.