Senior Airman Julia Axtell, 28th Munitions Squadron line delivery crew member, prepares the ordnance assembly line for the munitions part of the Global Strike Challenge at Ellsworth Air Force Base S.D., Aug. 20, 2015. During the competition, teams showcase job proficiency and teamwork in a controlled environment. (U.S. Air Force photo by Airman 1st Class James L. Miller/Released)