Meeting Marines Defense Secretary Jim Mattis, center, poses for a photograph after meeting with Marines assigned to the NATO mission at NATO headquarters in Brussels, Feb. 15, 2017. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley SHARE: Download: Full Size (1.65 MB) Credit: Tech. Sgt. Brigitte Brantley VIRIN: 170215-D-GO396-0028A.JPG Photo Gallery