A security forces specialist (left) from the 193rd Special Operations Security Forces Squadron, Pennsylvania Air National Guard, defends himself during a single-assailant drill July 13, 2018 at the Middletown High School in Middletown, Pennsylvania. The 193rd SOSFS Airmen utilized the four defensive concepts (mobility, winning the angle, distance management, and transition) they learned from the previous two days to defend themselves in a hostile situation. (U.S. Air National Guard photo by Staff Sgt. Tony Harp/Released)