Which rank is indicated by the O-9 classification?

The rank indicated by the O-9 classification is Vice Admiral. In the U.S. military rank structure, the O-9 classification specifically corresponds to this rank, which is a three-star officer. Vice Admirals typically serve in senior leadership positions, overseeing substantial areas of responsibility or assisting in high-level operational aspects of naval commands.

In the context of naval ranks, Rear Admiral (UH) is identified as O-8 and refers to a two-star officer. Admiral, on the other hand, is classified as O-10, representing a four-star officer, which is a rank above Vice Admiral. Lieutenant is classified under O-3, representing a significantly lower rank. Understanding these classifications is crucial in grasping the hierarchy and structure of military ranks.