Walk and Talk Acting Defense Secretary Patrick M. Shanahan walks with NATO Secretary General Jens Stoltenberg at the Pentagon before their meeting on issues facing the alliance, Jan. 28, 2019. SHARE: Download: Full Size (2.82 MB) Tags: Shanahan, nato, Acting Secretary of Defense Credit: Army Sgt. Amber I. Smith, DOD VIRIN: 190128-D-SV709-0287C.JPG Photo Gallery