NATO Press Conference Defense Secretary Jim Mattis speaks at a press conference at NATO headquarters in Brussels, Feb. 16, 2017. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley SHARE: Download: Full Size (1.74 MB) Credit: Tech. Sgt. Brigitte Brantley VIRIN: 170216-D-GO396-0342A.JPG Photo Gallery