A Finnish F/A-18 Hornet waits while a U.S. Air Force F-15C Eagle takes off at Rovaniemi Air Base, Finland, May 22, in support of Arctic Challenge 2017. Finland is one of the hosts of the two-week long exercise, aimed at improving overall coordination between allies and partner militaries. (U.S. Air Force photo/Airman 1st Class Abby L. Finkel)