What is the rank for E-9 (Special) in the Marine Corps?

The rank for E-9 (Special) in the Marine Corps is the Sergeant Major of the Marine Corps. This rank is unique because it represents the highest enlisted rank in the Marine Corps and is distinguished from other E-9 ranks. The Sergeant Major of the Marine Corps serves as a senior advisor to the Commandant of the Marine Corps and plays a critical role in addressing enlisted personnel’s needs and concerns.

The significance of this position goes beyond that of other E-9 ranks, as it symbolizes a leadership role that influences policies and the overall welfare of enlisted Marines across the entire Corps. The other ranks listed, while also important, either do not reach the same level of distinction or are part of different service branches entirely, such as Chief Petty Officer, which belongs to the Navy. Thus, the identification of the correct rank as Sergeant Major of the Marine Corps reflects a clear understanding of the Marine Corps structure and its hierarchy.