Esper Remarks Defense Secretary Dr. Mark T. Esper speaks at the Air Force Association’s 2019 Air, Space and Cyber Conference in National Harbor, Md., Sept. 18, 2019. SHARE: Download: Full Size (0.58 MB) Tags: Defense Secretary, Esper Credit: Wayne Clark, Air Force VIRIN: 190918-F-AZ553-0073.JPG Photo Gallery