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Associated Press
FILE - In this Sept. 7, 2011 file photo, John Brennan, Assistant to the President for Homeland Security and Counterterrorism, speaks in Washington. After a decade of costly conflict in Iraq and Afghanistan, the American way of war is evolving toward less brawn, more guile. Drone aircraft spy on and attack terrorists with no pilot in harm's way. Small teams of special operations troops quietly train and advise foreign forces. Viruses sent from computers to foreign networks strike silently, with no American fingerprint. (AP Photo/Susan Walsh, File)

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