Top portion of the Service Chain of Command?

• A. President; Secretary of Defense; Secretary of the Navy; Commandant of the Marine Corps
• B. President; Secretary of the Navy; Commandant of the Marine Corps; Chairman of the Joint Chiefs
• C. Secretary of Defense; Secretary of the Navy; Commandant of the Marine Corps; Chief of Staff
• D. President; Secretary of Defense; Commandant of the Marine Corps; Secretary of the Army

Answer: (A)

Understanding the service chain of command means recognizing who holds ultimate authority within a single service structure. At the top, the President serves as Commander in Chief, followed by the Secretary of Defense, who oversees all military services. Within the Navy/Marine Corps system, the civilian head is the Secretary of the Navy, and the senior uniformed officer who commands the Marine Corps is the Commandant of the Marine Corps, reporting to the Secretary of the Navy. The Chairman of the Joint Chiefs of Staff acts as a senior military advisor within the joint system, not as part of the direct service chain of command. That’s why the top portion of the Marine Corps’ service chain is President → Secretary of Defense → Secretary of the Navy → Commandant of the Marine Corps.