Defense Secretary Ash Carter, at lectern, speaks during a press briefing with, from left, Marine Corps Gen. Joe Dunford; chairman of the Joint Chiefs of Staff; Army Gen. Joseph Votel, commander of U.S. Central Command; and Army Gen. Raymond Thomas, commander of U.S. Special Operations Command, at MacDill Air Force Base, Fla., March 30, 2016. Votel and Thomas assumed leadership of their respective commands during ceremonies earlier in the day. DoD photo