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Associated Press
FILE - In this May 23, 2013 file photo, President Barack Obama talks about national security, at the National Defense University at Fort McNair in Washington. The president left plenty of ambiguity in new policy guidelines that he says will restrict how and when the U.S. can launch targeted drone strikes, leaving himself vast power over how and when the weapons can be deployed. (AP Photo/Carolyn Kaster, File)

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