What rank is classified as O-5 in the military hierarchy?

The rank classified as O-5 in the military hierarchy is Commander. This ranking is part of the officer classification system where the "O" denotes officer, and the number corresponds to the specific level of rank. An O-5 rank typically involves responsibilities that include leadership of a naval, maritime, or air unit at the command level, where they have significant strategic and operational duties.

In contrast, the other ranks do not fall under the O-5 category. For instance, Lieutenant Commander is classified as O-4, which is a step lower than Commander. Meanwhile, Vice Admiral and Admiral are higher ranks classified as O-9 and O-10, respectively, indicating greater levels of authority and responsibility within the naval hierarchy. Understanding this classification helps clarify the structure and progression of ranks in the military, which is essential for comprehension in military studies and cadet training.