Dr. Mark T. Esper Defense Secretary Dr. Mark T. Esper visits with a service member at Walter Reed National Military Medical Center in Bethesda, Md., March 6, 2020. SHARE: Download: Full Size (1.19 MB) Tags: Defense Secretary, Esper Credit: Lisa Ferdinando, DOD VIRIN: 200306-D-BN624-0559.JPG Photo Gallery