What is one designation that could be held by an E-9 rank in the Marine Corps?

An E-9 rank in the Marine Corps is the highest enlisted rank, and one of the designations that could be held at this level is Sergeant Major of the Marine Corps. This position is a critical leadership role, representing the enlisted force to the commandant and providing advice on matters affecting enlisted personnel. The Sergeant Major of the Marine Corps serves as a key advisor to senior leadership and plays a vital role in improving morale, discipline, and welfare among enlisted members.

In contrast, while Master Sergeant is also an E-9 rank, it does not carry the same prestigious title or responsibilities as the Sergeant Major of the Marine Corps. The designations of Lance Corporal and Corporal reflect much lower ranks—specifically E-3 and E-4 respectively—serving as entry-level or junior non-commissioned officer positions. Hence, they do not relate to the E-9 category.