Pentagon Steps Acting Defense Secretary Patrick M. Shanahan walks with Polish Defense Minister Mariusz Blaszczak into the Pentagon during an honor cordon, June 11, 2019. SHARE: Download: Full Size (1.31 MB) Tags: Shanahan, partnerships, leaders, Acting Defense Secretary Credit: Army Sgt. Amber I. Smith, DOD VIRIN: 190611-D-SV709-0074E.JPG Photo Gallery