Airmen and their families view a B-25 Mitchell bomber on display during the 34th and 37th Bomb Squadron’s 100th anniversary celebration at Ellsworth Air Force Base, S.D., June 12, 2017. The squadrons are two of the oldest in the Air Force, with the 34th BS formed on May 10, 1917, and the 37th on June 13, 1917. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)