What rank does O-10 represent?

The rank O-10 represents the title of Fleet Admiral in the United States Navy. This rank is the highest possible rank and is reserved for wartime use; it has only been held by a handful of individuals in U.S. history. While other ranks like Admiral (O-9) and Vice Admiral (O-8) exist, they do not reach the same hierarchical level as the Fleet Admiral. The Fleet Admiral rank is distinguished by its exceptional responsibilities and authority, often overseeing large naval operations and strategic military planning.

Thus, understanding the rank structure in the military is critical, as ranks correspond to specific roles and duties, and O-10 signifies the pinnacle of naval command capabilities.