Pentagon Visit President Donald J. Trump walks with Acting Defense Secretary Patrick M. Shanahan during a visit to the Pentagon, March 15, 2019. SHARE IMAGE: Download Image: Full Size (1.69 MB) Tags: Shanahan, Donald J. Trump, President, Acting Defense Secretary Photo By: Master Sgt. Angelita M. Lawrence VIRIN: 190315-D-HA938-0005A.JPG Photo Gallery