Which of the following is NOT a responsibility of a Sergeant Major?

The role of a Sergeant Major within the Marine Corps is critical in maintaining effective unit operations and soldier welfare. While a Sergeant Major plays a significant part in training coordination, that responsibility typically falls more directly to officers and subordinate non-commissioned officers. The primary duties of a Sergeant Major focus on the conduct of enlisted personnel, establishing discipline, and enhancing morale within the unit.

Conduct of enlisted personnel involves guidance and oversight to ensure that all ranks uphold military standards and values. Discipline is a fundamental aspect of a Sergeant Major's duties, as they enforce rules and regulations, helping to maintain order and discipline within the ranks. Additionally, morale enhancement is a vital responsibility, as Sergeant Majors work to foster a positive environment and support the welfare and cohesion of the unit.

Therefore, while training coordination is an essential function in the Marine Corps, it is not predominantly a responsibility assigned to a Sergeant Major, thus making it the correct answer to the question.