What is the title for O-7?

The title for O-7 is indeed Rear Admiral (Lower Half) in the Navy or Brigadier General in the Army, Air Force, and Marine Corps. This rank serves as the entry-level flag officer rank, marking the transition from senior officer to flag officer, which is significant in military hierarchy. The designation of Rear Admiral (Lower Half) reflects the officer's role in naval operations, whereas Brigadier General represents the corresponding rank in the other branches, reinforcing the structure and command responsibilities associated with this level of authority.

The choice of Fleet Admiral is reserved for a five-star rank that is not applicable as it is a higher rank than O-7. Admiral and General represent O-9 status, which is also beyond O-7. Vice Admiral and Lieutenant General are both ranks at O-8, indicating that they are also above the O-7 level. Thus, the provided rank of Rear Admiral (Lower Half) or Brigadier General clearly aligns with the O-7 designation as it is the correct classification for this level in the military rank structure.