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 IMAGE: Download Image: Full Size (2.67 MB) Tags: Shanahan, Acting Defense Secretary Photo By: Lisa Ferdinando, DOD VIRIN: 140219-D-BN624-0526C.JPG Photo Gallery