FILE - In this Dec. 21. 2017, file photo, Defense Secretary Jim Mattis talks to U.S. Marine Corps troops at a rifle range at Guantanamo Bay, Cuba. 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/Robert Burns, File)
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