WASHINGTON, DC - DECEMBER 09: U.S. Defense Secretary Ashton Carter (L) and Vice Chairman of the Joint Chiefs of Staff Air Force Gen. Paul Selva (R) testify during a hearing before the Senate Armed Services Committee December 9, 2015 on Capitol Hill in Washington, DC. The committee held a hearing on the U.S. strategy to counter the Islamic State of Iraq and the Levant and U.S. policy toward Iraq and Syria. (Photo by Alex Wong/Getty Images)
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