Exercise Polar Force 19-1
Airmen from Joint Base Elmendorf-Richardson, Alaska, wait in a Humvee to conduct a post-attack reconnaissance following a simulated chemical, biological, radiological and nuclear defense attack for exercise Polar Force 19-1, Oct. 25, 2018. The exercise tests the base's ability to integrate, mobilize and prepare assigned personnel, aircraft and equipment for a wartime mission. (U.S. Air Force photo by Staff Sgt. James Richardson)