Brig. Gen. Derin S. Durham accepts the Fourth Air Force flag from Lt. Gen. John Healy, Air Force Reserve Command commander and chief of the Air Force Reserve, during an assumption of command ceremony at March Air Reserve Base, California, September 10. Fourth Air Force's mission is to provide combat-ready Airmen to answer the nation's call with global rapid mobility. Durham previously served as the director of Air, Space and Information Operations at AFRC headquarters, Robins Air Force Base, Georgia. (U.S. Air Force photo by Staff Sgt. Kekoa Santiago)