This part applies to the Office of the Secretary of Defense; the Military Departments, including the Coast Guard when it is not operating as a Military Service in the Department of the Navy by agreement with the Department of Transportation; the Chairman of the Joint Chiefs of Staff; and the Defense Agencies (referred to collectively in this part as ``the DoD Components''). The term ``Military Departments,'' as used in this part, refers to the Departments of the Army, Navy, and Air Force. The term ``Secretary concerned'' refers to the Secretaries of the Military Departments and the Secretary of Transportation with respect to the Coast Guard when it is not operating as a Service in the Department of the Navy. The term ``Military Services'' refers to the Army, the Navy, the Air Force, the Marine Corps, and the Coast Guard.