WASHINGTON, DC – SEPTEMBER 16: U.S. Defense Secretary Chuck Hagel (L) and Chairman of the Joint Chiefs of Staff Army Gen. Martin Dempsey testify before the Senate Armed Services Committee in the Hart Senate Office Building on Capitol Hill September 16, 2014 in Washington, DC. Senators questioned the top military and civilian leaders about the threat posed by the terrorist group calling itself the Islamic State of Iraq and the Levant or ISIL. (Photo by Chip Somodevilla/Getty Images)