A B-1 bomber assigned to the 37th Bomb Squadron performs a high-speed flyover during a Base Appreciation Day at Ellsworth Air Force Base, S.D., Sept. 16, 2017. The event was hosted in recognition of the U.S. Air Force’s 70th Anniversary, highlighting the innovation, teamwork and heritage of our Airmen. (U.S. Air Force photo by Senior Airman Denise M. Jenson)