Secretary of Defense Ash Carter speaks with former U.S. Senators Carl Levin, D-Mich., and John W. Warner, R-Va., prior to a ceremony in which the secretary honored their distinguished service to the Defense Department while they served as chairmen of the Senate Armed Forces Committee in a Pentagon ceremony in the Hall of Heroes, Sept. 21, 2016. Carter also dedicated the Levin-Warner Legislative Affairs Suite in the Pentagon during the ceremony. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley