Secretary Talk Defense Secretary Jim Mattis interacts with audience members before speaking during the Air Force Association Air, Space and Cyber Conference in National Harbor, Md., Sept. 20, 2017. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley SHARE IMAGE: Download Image: Full Size (1.44 MB) Photo By: Brigitte N. Brantley VIRIN: 170920-D-GO396-0007L.JPG Photo Gallery