Crew chiefs from the 100th Aircraft Maintenance Squadron, RAF Mildenhall, England, conduct night maintenance during Exercise Trident Juncture 18, at Rovaniemi, Finland, Oct. 29, 2018. The exercise takes place in Norway and the surrounding areas of the North Atlantic and the Baltic Sea, including Iceland and the airspace of Finland and Sweden. With more than 50,000 participants, this is the largest NATO exercise since 2002. (U.S. Air Force photo by Senior Airman Luke Milano)