Identifying the rank of O-8 in the Navy, what is it?

In the Navy, the rank of O-8 is classified as Rear Admiral. This rank is a flag officer position and is one of the higher ranks within the Navy, sitting above Captain (O-6) and below Vice Admiral (O-9). Rear Admirals typically have significant responsibility in leadership and management roles, often overseeing large commands, operational groups, or serving in high-level advisory or staff capacities.

The other ranks listed refer to lower rankings within the Navy's hierarchy. Captain is O-6 and is command-level but does not reach the flag officer status of a Rear Admiral. Chief Petty Officer and Petty Officer Second Class are both enlisted ranks, with Chief Petty Officer being E-7 and Petty Officer Second Class being E-5. Neither of these ranks falls within the officer category, which starts with Ensign at O-1. Thus, the identification of O-8 as Rear Admiral is accurate and reflects the structure and rank designations in the Navy.