U.S. Air Force Airman 1st Class Bryce Mullen, 317th Aircraft Maintenance Squadron special missions aircraft maintainer, aims down the sights of a simulator M-4 rifle at Dyess Air Force Base, Texas, March 21, 2018. Mullen was using the Engagement Skills Trainer 2000, which puts first responders in simulations where the use of force might be necessary. All 7th Security Forces Squadron personnel and augmentees train on the EST 2000 before being able to bear arms on Dyess. (U.S. Air Force photo by Airman River Bruce)