The U.S. Navy flight demonstration squadron, the Blue Angels, alongside the U.S. Air Force flight demonstration squadron, the Thunderbirds, fly in formation above Philadelphia, PA. as a salute to frontline COVID-19 responders April 28, 2020. U.S. Northern Command, through U.S. Army North, is providing military support to the Federal Emergency Management Agency to help communities in need. (U.S. Army photo by Pfc. Joshua Cowden, 22nd Mobile Public Affairs Detachment)