Airmen of the world meet at Arctic Challenge 2017
An F-15C Eagle from the 493rd Fighter Squadron, Royal Air Force Lakenheath, England, prepares for the first sortie of the day at Rovaniemi Air Base, Finland, May 25, in support of Arctic Challenge 2017. Continued, realistic interoperability exercises, such as ACE 17, allow the U.S., allies and partner nations to build their aerial expertise. (U.S. Air Force photo/Airman 1st Class Abby L. Finkel)