Pentagon Steps Acting Defense Secretary Patrick M. Shanahan accompanies NATO Secretary General Jens Stoltenberg as they enter the Pentagon for a meeting on issues facing the alliance, Jan. 28, 2019. SHARE: Download: Full Size (1.61 MB) Tags: Shanahan, NATO, Acting Secretary of Defense Credit: Army Sgt. Amber I. Smith, DOD VIRIN: 190128-D-SV709-0107.JPG Photo Gallery