U.S. Air Force Staff Sgt. Miguel Aviles, 31st Aircraft Maintenance Squadron electrical and environmental craftsman, performs liquid nitrogen servicing during exercise Agile Wyvern at Cerklje ob Krki Air Base, Slovenia, Sept. 8, 2021. Liquid nitrogen’s temperature is minus 321 degrees Fahrenheit and assists in the process of airing up F-16 Fighting Falcon’s tires. (U.S. Air Force photo by Senior Airman Brooke Moeder)