First Lt. Harold Engler, 34th Bomb Squadron weapon systems officer, describes the operations of a B-1 bomber to Claire and Madeline Brakke during the 2016 Aviation Day at the Discovery Center in Pierre, S.D., Jan. 27, 2016. Five aircrew members from Ellsworth Air Force Base, S.D., traveled to Pierre to participate in the event, making it a memorable experience for children from across the state. (U.S. Air Force photo by Senior Airman Rebecca Imwalle/Released)