NATO Walk Defense Secretary Jim Mattis, center, NATO Secretary General Jens Stoltenberg, second from right, and British Defense Secretary Gavin Williamson, right, walk to a meeting at NATO headquarters in Brussels, Nov. 8, 2017. DoD photo by Air Force Staff Sgt. Jette Carr SHARE: Download: Full Size (0.62 MB) Credit: Jette Carr VIRIN: 171108-D-GY869-144A.JPG Photo Gallery