U.S. Air Force Tech. Sgt. Luke Clift, a security forces specialist with the 182nd Security Forces Squadron, Illinois Air National Guard, blocks a cordon checkpoint during an exercise in Peoria, Ill., Aug. 14, 2017. The exercise evaluated unit members’ responses to a variety of contingency scenarios. (U.S. Air National Guard photo by Tech. Sgt. Lealan Buehrer)