Mattis Speaks to Members Defense Secretary Jim Mattis speaks with members of the Defense Innovation Unit Experimental (DIUx) in Mountain View, Calif., Aug. 10, 2017. DoD photo by Air Force Staff Sgt. Jette Carr SHARE IMAGE: Download Image: Full Size (0.98 MB) Tags: Secretary of Defense , mattis, JIm Mattis, SecDef Photo By: Jette Carr VIRIN: 170810-D-GY869-141.JPG Photo Gallery