Defense Secretary Ash Carter conducts a news conference on MacDill Air Force Base in Tampa, Fla., Jan. 14, 2016. The secretary is flanked by Marine Corps Gen. Joseph F. Dunford Jr., chairman of the Joint Chiefs of Staff, left, and Army Gen. Lloyd J. Austin III, commander of U.S. Central Command. DoD photo by Army Sgt. 1st Class Clydell Kinchen