President Donald Trump shakes hands with U.S. Army Chief of Staff, Gen. Mark A. Milley following the 9/11 Observance Ceremony at the Pentagon in Arlington, Va., Sept. 11, 2017. (DOD photo by Army Sgt. Amber I. Smith)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/68842444@N03">Jim Mattis</a>
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