Capt. Ryan Koelling, a weapons system officer assigned to the 34th Bomb Squadron, boards a B-1 Bomber at Ellsworth Air Force Base, S.D., Oct. 18, 2017. Approximately 200 Ellsworth Airmen departed for Nellis AFB, to train with Joint Terminal Attack Controllers and soldiers from U.S. Army National Training Center in Fort Irwin, Calif., as part of Green Flag exercise 18-1. (U.S. Air Force photo by Airman 1st Class Thomas Karol)