What is the O-5 rank in the Navy?

In the Navy, the O-5 rank is designated as Captain. This rank is a senior officer position, where individuals are typically in charge of larger ships or significant shore-based installations. They often oversee an entire battalion or a similar level of command, and their responsibilities include not only leading their units but also managing personnel and administrative functions.

The other ranks listed have different designations within the Navy's officer structure. A Commander, for instance, is an O-5 rank and is responsible for smaller vessels or specialties but does not hold the same level of command as a Captain. Rear Admiral and Vice Admiral are higher ranks, at O-7 and O-8 respectively, and therefore are not applicable to the O-5 designation.