What is the highest rank in the USCG indicated by the O-10 classification?

The highest rank in the U.S. Coast Guard indicated by the O-10 classification is Admiral. This rank represents the top tier of leadership within the Coast Guard and is typically held by the Commandant of the Coast Guard or other senior leaders. The role of an Admiral encompasses significant responsibilities, including strategic oversight of operations, policy formulation, and representation of the Coast Guard at the highest levels of government and military.

In comparison, Vice Admiral is an O-9 rank, which is one step below Admiral and typically involved in major command and operational leadership roles but does not reach the pinnacle of the service. Rear Admiral Lower Half is classified at the O-7 level and also occupies significant positions, but is still beneath the ranks of Vice and Full Admiral. Captain is an O-6 rank and represents a high level of command but is distinctly lower than the ranks of Admiral or Vice Admiral.