“ The Secretary of Defense may reassign the functions assigned to him by sections 1 (a) and (b) of this order only to civilian officers within the Office of the Secretary of Defense (as defined in section 131 (b) of title 10, United States Code) who hold a position for which the President makes an appointment by and with the advice and consent of the Senate. The Secretary of Defense may not reassign the function assigned to him by section 1 (c) of this order. ”