The United States Air Force Air Demonstration Squadron Thunderbirds and U.S. Navy Flight Demonstration Squadron Blue Angels fly over Philadelphia, Pa., April 28, 2020. The flyover was part of America Strong; a collaborative salute from the Air Force and Navy to recognize healthcare workers, first responders, military, and other essential personnel while standing in solidarity with all Americans during the COVID-19 pandemic. (U.S. Air Force photo/Staff Sgt. Cory W. Bush)