U.S. Air Force F-16 Fighting Falcon aircraft and Airmen assigned to the 52nd Fighter Wing at Spangdahlem Air Base, Germany, arrive at Kallax Air Base, Sweden, May 17, 2021. The aircraft will support Arctic Challenge Exercise 21 which builds interoperability with allies and partners to demonstrate capability and convey a strong deterrent message. (U.S. Air Force photo by Senior Airman Ali Stewart)