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WASHINGTON, DC - JULY 07:  Committee chairman Sen. John McCain (R-AZ) questions U.S. Secretary of Defense Ashton Carter during a hearing held by the Senate Armed Services Committee July 7, 2015 in Washington, DC. Carter and Joint Chiefs of Staff Chairman Gen. Martin Dempsey (R) testified on the topic of "Counter-ISIL Strategy."  (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - JULY 07:  Committee chairman Sen. John McCain (R-AZ) questions U.S. Secretary of Defense Ashton Carter during a hearing held by the Senate Armed Services Committee July 7, 2015 in Washington, DC. Carter and Joint Chiefs of Staff Chairman Gen. Martin Dempsey (R) testified on the topic of "Counter-ISIL Strategy."  (Photo by Win McNamee/Getty Images)

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