U.S. Air Force Staff Sgt. Antonio Lofton, 86th Security Forces Squadron instructor, simulates being an active shooter during an exercise at the 86th Maintenance Group on Ramstein Air Base, Germany, July 12, 2017. Multiple organizations such as command post and security forces are notified prior to the exercise to practice emergency procedures. (U.S. Air Force photo by Staff Sgt. Nesha Humes)