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 IMAGE: Download Image: Full Size (1.86 MB) Tags: air force, independence day, acting defense secretary, esper Photo By: Lisa Ferdinando, DOD VIRIN: 190704-D-BN624-0509Y.JPG Photo Gallery