FILE - In this Oct. 30, 2017, file photo, Secretary of Defense Jim Mattis, testifies during a Senate Foreign Relations Committee hearing on "The Authorizations for the Use of Military Force: Administration Perspective" on Capitol Hill in Washington. For only the second time since 9/11, America’s defense secretary didn’t visit U.S. troops in a war zone during December, breaking a longstanding tradition of personally and publicly thanking service members in combat who are separated from their families during the holiday season. (AP Photo/Manuel Balce Ceneta, File)
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