Pentagon Media Brief Chief Pentagon spokesperson Dana W. White and Marine Corps Lt. Gen. Kenneth F. McKenzie Jr., the director of the Joint Staff, brief Pentagon reporters at the Pentagon, Oct. 5, 2017. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley SHARE: Download: Full Size (1 MB) Tags: brigitte brantley, department of defense, Defense Secretary, SecDef, pentagon, Secretary of Defense, james mattis, JIM MATTIS, Chaos, Photo, DoD, Military Credit: Brigitte N. Brantley VIRIN: 171005-D-FN314-001.JPG Photo Gallery