A Finnish F/A-18 Hornet takes off at Rovaniemi Air Base, Finland, May 22, in support of Arctic Challenge 2017. Through exercises such as ACE 17, U.S., allies and partner nations are able to build on their expertise in the air and create a force ready to respond to a crisis together. (U.S. Air Force photo/Airman 1st Class Abby L. Finkel)