What rank is associated with the O-9 designation?

The O-9 designation is associated with the rank of Vice Admiral. In the U.S. military's rank structure, commissioned officers are categorized by pay grades, with the rank of Vice Admiral sitting at O-9. This rank typically indicates a senior-level officer who may command a naval fleet or serve in high-level operational or administrative roles within the Navy.

In contrast, the other ranks listed are associated with different pay grades; for example, Admiral is an O-10 rank, which is the highest commission officer rank in the Navy. Rear Admiral Upper Half is classified as O-8, and Chief Warrant Officer Four is much lower on the hierarchy, categorized as W-4. Understanding these distinctions is vital for recognizing the hierarchy and responsibilities within the naval command structure.