U.S. Air Force Gen. Terrence O’Shaughnessy, commander, U.S. Northern Command and North American Aerospace Defense Command, speaks during a virtual change of command ceremony July 29, 2020, at Tyndall Air Force Base, Florida. The ceremony saw command of Continental U.S. North American Aerospace Defense Command Region transfer from Lt. Gen. Marc Sasseville to Lt. Gen. Kirk Pierce. (U.S. Air Force photo/Tech. Sgt. Clayton Lenhardt)