U.S. Air Force Tech. Sgt. Ian Ginn, 423rd Security Forces Squadron NCOIC of physical security, responds to a simulated attacker threat during a preparedness exercise at RAF Alconbury, England, May 20, 2019. The exercise tested the 501st Combat Support Wing preparedness and response capabilities to an emergency situation. (U.S. Air Force photo by Airman 1st Class Jennifer Zima)