An Air Force F-15E Strike Eagle flies alongside an Air Force KC-135 Stratotanker after an aerial refueling over Finland, May 25, 2017. The aircraft are participating in Arctic Challenge 2017, a multinational exercise encompassing 11 nations and more than 100 aircraft. Air Force photo by Tech. Sgt. David Dobrydney

An Air Force F-15E Strike Eagle flies alongside an Air Force KC-135 Stratotanker after an aerial refueling over Finland, May 25, 2017. The aircraft are participating in Arctic Challenge 2017, a multinational exercise encompassing 11 nations and more than 100 aircraft. Air Force photo by Tech. Sgt. David Dobrydney

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