Standing guard
U.S. Air Force Staff Sgt. Kathleen Sullivan, a standardization and evaluation member with the 35th Security Forces Squadron, observes security forces members as they clear rooms during the Beverly Sunrise 16-05 active shooter exercise held July 29, 2016, at Misawa Air Base, Japan. During the exercise, Sullivan evaluated security forces members' capabilities in responding to a crisis situation. (U.S. Air Force photo by Senior Airman Brittany A. Chase)