What title does O-7 refer to?

O-7 refers to the rank of Rear Admiral (Lower Half) in the naval services or Brigadier General in the army. Each branch of the military utilizes a rank structure designated by the "O" and "E" numbering system to identify officer ranks. Specifically, "O" denotes an officer, and the number indicates their rank level; with O-7 being a one-star rank.

In the navy, the designation of Rear Admiral (Lower Half) signifies this rank as the entry level for flag officers. In the army and air force, this same rank equates to Brigadier General, reflecting the structure that allows for comparative hierarchy across the services. Recognizing that O-7 indicates a one-star officer rank helps in understanding the progression in military ranks and the command responsibilities associated with them, such as leading larger units and holding staff positions.