Honor Guard Chat Acting Defense Secretary Dr. Mark T. Esper talks with Air Force Honor Guard members at the Salute to America Independence Day celebration in Washington, July 4, 2019. SHARE: Download: Full Size (1.86 MB) Tags: INDEPENDENCE DAY, Air Force, Esper, Acting Defense Secretary Credit: Lisa Ferdinando, DOD VIRIN: 190704-D-BN624-0509Y.JPG Photo Gallery