Moderated Talk Defense Secretary Dr. Mark T. Esper takes part in a discussion moderated by Sir John Scarlett, vice chairman of the Royal United Services Institute, in London, Sept. 6, 2019. SHARE IMAGE: Download Image: Full Size (0.6 MB) Tags: defense secretary, esper Photo By: Lisa Ferdinando, DOD VIRIN: 190906-D-BN624-0853.JPG Photo Gallery