Pentagon Handshake Defense Secretary Dr. Mark T. Esper welcomes Australian Prime Minister Scott Morrisson to the Pentagon, Sept. 20, 2019. SHARE IMAGE: Download Image: Full Size (0.48 MB) Tags: Defense Secretary , SecDef, Australia, Esper Photo By: Lisa Ferdinando, DOD VIRIN: 190920-D-BN624-0158.JPG Photo Gallery