President Barack Obama participates in a briefing from top military leaders while visiting U.S. Central Command at MacDill Air Force Base in Tampa, Florida, September 17, 2014. From L-R are: United States Homeland Security Advisor Lisa Monaco, National Security Advisor Susan E. Rice, U.S. Secretary of Defense Chuck Hagel, Obama, Commander of Central Command Gen. Lloyd Austin III and U.S. Special Operations Commander Joseph Votel. 