Which of the following ranks is classified as O-7 in the Marine Corps?

The rank classified as O-7 in the Marine Corps is Brigadier General. This rank is the first general officer rank and denotes a one-star general. In the context of military pay grades, the O-7 designation is specifically reserved for Brigadier Generals, reflecting their senior leadership role and responsibilities within the Marine Corps. This rank typically involves overseeing significant operations and commands, leading units, and advising higher command on various operational matters.

Other ranks listed, such as Captain and Major, fall under different enlisted and officer classifications, with Captain being an O-3 and Major an O-4. Lieutenant General is classified as O-9, which is a three-star general rank. Understanding these classifications is crucial for recognizing the hierarchy and structure within Military commands.