10 USC 133b - Deputy Under Secretary of Defense for Logistics and Materiel Readiness

(a) There is a Deputy Under Secretary of Defense for Logistics and Materiel Readiness, appointed from civilian life by the President, by and with the advice and consent of the Senate. The Deputy Under Secretary shall be appointed from among persons with an extensive background in the sustainment of major weapon systems and combat support equipment.
(b) The Deputy Under Secretary is the principal adviser to the Secretary and the Under Secretary of Defense for Acquisition, Technology, and Logistics on logistics and materiel readiness in the Department of Defense and is the principal logistics official within the senior management of the Department of Defense.
(c) The Deputy Under Secretary shall perform such duties relating to logistics and materiel readiness as the Under Secretary of Defense for Acquisition, Technology, and Logistics may assign, including
(1) prescribing, by authority of the Secretary of Defense, policies and procedures for the conduct of logistics, maintenance, materiel readiness, and sustainment support in the Department of Defense;
(2) advising and assisting the Secretary of Defense, the Deputy Secretary of Defense, and the Under Secretary of Defense for Acquisition, Technology, and Logistics providing guidance to and consulting with the Secretaries of the military departments, with respect to logistics, maintenance, materiel readiness, and sustainment support in the Department of Defense; and
(3) monitoring and reviewing all logistics, maintenance, materiel readiness, and sustainment support programs in the Department of Defense.