Pentagon Meeting Defense Secretary Jim Mattis, right, walks with NATO Secretary General Jens Stoltenberg before a meeting at the Pentagon, March 21, 2017. DoD photo by Army Sgt. Amber I. Smith SHARE IMAGE: Download Image: Full Size (1.09 MB) Photo By: Sgt. Amber I. Smith VIRIN: 170321-D-SV709-029.JPG Photo Gallery