Independent contractors use a crane to place a conex building during the construction of the Military Operations Urban Terrain training area at Ellsworth Air Force Base, S.D., March 21, 2016. The training facility will be used bi-weekly by the 28th Security Forces Squadron to cover active shooters, work place violence, combat readiness tasks and shoot-move-communicate exercises. (U.S. Air Force photo by Airman 1st Class Sadie Colbert/Released)