Which of the following ranks represents E-9 in the Marine Corps?

In the Marine Corps, the rank that represents E-9 is Master Gunnery Sergeant. This rank is one of the highest enlisted ranks and is distinguished by its advanced level of responsibility and expertise in technical and leadership roles. A Master Gunnery Sergeant typically oversees specific technical fields and plays a crucial role in mentoring junior Marines.

The other ranks listed do not correspond to the E-9 pay grade. Gunnery Sergeant is an E-7 rank, Colonel is an O-6 officer rank, and Master Gunner is often a title related to specific duties but is not an established rank within the enlisted classification system like Master Gunnery Sergeant. Understanding the hierarchy and the specific roles associated with each rank in the Marine Corps is important for grasping how the military structure operates.