200428-N-KT595-1131 PHILADELPHIA (April 28, 2020) The U.S. Navy Flight Demonstration Squadron, the Blue Angels, and the Air Force Air Demonstration Squadron, the Thunderbirds, fly over Philadelphia during the America Strong flyover, April 28, 2020. America Strong is a collaborative salute from the Navy and Air Force to recognize healthcare workers, first responders, and other essential personnel in a show of national solidarity during the COVID-19 pandemic. (U.S. Navy photo by Mass Communication Specialist 1st Class Chad M. Butler/Released)