Chairman of the Joint Chiefs of Staff U.S. Army Gen. Martin E. Dempsey, center right, speaks with ABC News correspondent Martha Raddatz at the Pentagon in Arlington, Va., Oct. 7, 2014. Dempsey answered questions about U.S. airstrikes against extremists in Syria and Iraq and discussed the U.S. military's role in fighting the Ebola outbreak in western Africa. (DoD photo by Mass Communication Specialist 1st Class Daniel Hinton, U.S. Navy/Released)