U.S. Secretary of Defense Ash Carter (L) and Chairman of the Joint Chiefs of Staff General Martin Dempsey testify during a Senate Armed Services Committee hearing on "Counter-ISIL (Islamic State of Iraq and the Levant) Strategy" on Capitol Hill in Washington, United Styates, July 7, 2015. The United States was only training about 60 Syrian opposition fighters to battle Islamic State as of July 3, far below expectations, partly due to rigorous U.S. vetting of recruits, Carter told Congress on Tuesday. REUTERS/Kevin Lamarque