Mattis Briefing Defense Secretary Jim Mattis briefs the press at NATO headquarters in Brussels, June 29, 2017. DoD photo by Air Force Staff Sgt. Jette Carr SHARE IMAGE: Download Image: Full Size (1.48 MB) Tags: Travels , JIm Mattis, European Command, Eucom, SecDef, NATO Photo By: Air Force Staff Sgt. Jette Carr VIRIN: 170629-D-GY869-592.JPG Photo Gallery