Which rank would a Rear Admiral Lower Half be classified as in terms of officer designation?

A Rear Admiral Lower Half is classified as an O7 rank in terms of officer designation. This classification reflects the structure of the United States Navy's rank system, where officer ranks are indicated by a specific "O" number format.

In this system, the number corresponds to the officer's grade; for instance, O5 represents a Commander, O6 is a Captain, and O8 signifies a Rear Admiral Upper Half. The designation of O7 for a Rear Admiral Lower Half indicates that this position is above O6 but below O8, thereby positioning it as a one-star admiral rank, which is an entry-level flag officer rank in the Navy. This understanding is crucial for comprehending the hierarchy and responsibilities that come with various officer ranks within the naval structure.