Which Commandant installed the office of Sergeant Major of the Marine Corps?

The office of Sergeant Major of the Marine Corps was established under the command of General Pate. He recognized the need for a senior enlisted advisor who could provide guidance and leadership to the enlisted ranks in the Marine Corps. This role was created to ensure that the concerns and needs of enlisted personnel were represented at the highest levels of command, solidifying the importance of enlisted leadership within the Corps. General Pate's decision to institutionalize this position reflects a broader recognition of the vital role that non-commissioned officers play in maintaining morale and discipline within the Marine Corps.

While the other figures mentioned made significant contributions to the Marine Corps, they were not responsible for establishing the office of Sergeant Major of the Marine Corps.