U.S. Sen. John McCain, right, asks questions as Secretary of Defense Chuck Hagel and U.S. Army Gen. Martin E. Dempsey, the chairman of the Joint Chiefs of Staff, testify before the Senate Armed Services Committee at the Hart Senate Office Building in Washington, D.C., Sept. 16, 2014. Hagel and Dempsey testified about U.S. policy toward Iraq and Syria and the threat posed by the Islamic State in Iraq and the Levant.