Shanahan Handshake Acting Defense Secretary Patrick M. Shanahan exchanges greetings with Army Col. David M. Knych upon arriving in Munich, Feb. 14, 2019. Knych is the senior defense official and defense attaché at the U.S. Embassy in Berlin. SHARE: Download: Full Size (2.67 MB) Tags: Shanahan, Acting Defense Secretary Credit: Lisa Ferdinando, DOD VIRIN: 140219-D-BN624-0526C.JPG Photo Gallery