The Unite States Secretary of Defense (SECDEF) is the head of the U.S. Department of Defense (DoD), concerned with the armed services and military matters. The role of the Secretary of Defense is to be the principal defense policy advisor to the President and is responsible for the formulation of general defense policy and policy related to all matters of direct and primary concern to the DoD, and for the execution of approved policy. The Secretary is appointed by the President by and with the approval of the Senate, and is a member of the Cabinet. By statute the secretary must be a civilian who has not served in the active component of the armed forces for at least 10 years (10 U.S.C. § 113 - Note that Congress had passed a law to allow George Marshall to be appointed in 1950 despite having only been a civilian since 1945). The Secretary of Defense is sixth in the presidential line of succession.