Identify the individual who is the Sergeant Major of the Marine Corps.

The Sergeant Major of the Marine Corps is the highest enlisted rank and serves as the senior enlisted advisor to the Commandant of the Marine Corps. This individual plays a crucial role in advising on matters relating to enlisted personnel and helps to maintain the enlisted force's standards and policies. Sergeant Major Carlos Ruiz holds this prestigious position and is responsible for representing the interests of enlisted Marines in various capacities, including leadership and mentorship.

The other individuals listed in the choices are all high-ranking officers within the U.S. Marine Corps but do not hold the title of Sergeant Major of the Marine Corps. They may have different roles and responsibilities but are not the senior enlisted leader that Sergeant Major Ruiz is.