Memorial Visit Defense Secretary Jim Mattis visits the Pentagon Memorial Jan. 23, 2017, to pay his respects to those who lost their lives in the 9/11 attack on the building. DoD photo by Air Force Staff Sgt. Jette Carr SHARE IMAGE: Download Image: Full Size (1.91 MB) Tags: 9/11 , JIm Mattis, SecDef Photo By: Jette Carr VIRIN: 170123-D-GY869-170A.JPG Photo Gallery