Who was the first Sergeant Major?

The title of the first Sergeant Major in the United States Marine Corps is attributed to Sergeant Major Summers, making this the correct answer. Historically, Sergeant Major Summers was appointed as the first official Sergeant Major of the Marine Corps and served as a significant figure in establishing the role and its responsibilities. This position was created to provide guidance and support to the command structure, particularly in matters related to enlisted personnel. This foundational role helped shape the Sergeant Major's responsibilities, which include acting as a senior advisor to the commanding officer and representing the interests and welfare of enlisted Marines.

The other individuals listed may have held the rank of Sergeant Major or been notable figures within the Marine Corps, but none were designated as the first to hold this critical inaugural position within the structure of Marine Corps leadership. Understanding the historical context and the significance of Sergeant Major Summers' appointment helps underscore the importance of leadership roles in military organization and the evolution of enlisted ranks in the Marine Corps.