Georgia McCullough, Department of the Air Force officer, front, and Senior Airman Thomas Cruise, 82nd Security Forces Squadron patrolman, run down the hallway during an active shooter exercise at the elementary school on Sheppard Air Force Base, Texas, April 20, 2018. During the drill, Response Team members were evaluated on how thorough they were when searching, how quickly they eliminated any threats and how well they followed safety regulations. (U.S. Air Force photo by Airman 1st Class Pedro Tenorio)