Airmen assigned to the 673rd Security Forces Squadron defend Camp Mad Bull from a simulated attack during exercise Polar Force 21-5 at Joint Base Elmendorf-Richardson, Alaska, April 8, 2021. Polar Force is a training exercise designed to test JB Elmendorf-Richardon’s mission readiness and to help hone Airmen’s skills and techniques in a simulated expeditionary environment. (U.S. Air Force photo by Airman 1st Class Emily Farnsworth)