Airman 1st Class Lauren Sessums, 28th Munitions Squadron crew member, installs a delayed timer unit to a bomb dummy unit-50 during a training session at Ellsworth Air Force Base, S.D., Jan. 19, 2016. The DTU allows a pillow parachute to be deployed from the munition, enabling the bomb to detonate at lower altitudes for a close ground attack. (U.S. Air Force photo by Airman 1st Class Denise M. Nevins/Released)