Mattis Briefing Defense Secretary Jim Mattis briefs members of the Joint Civilian Orientation Course at the Pentagon, Aug. 7, 2017. The mission of JCOC is to increase public understanding of national defense by enabling American business and community leaders to directly observe and engage with the U.S. military. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley SHARE: Download: Full Size (1.2 MB) Credit: Brigitte N. Brantley VIRIN: 170807-D-GO096-0016.JPG Photo Gallery