An Air Force F-35 Lightning II from the Hill Air Force Base, Utah, is refueled by a 100th Air Refueling Wing KC-135 Stratotanker during a flight to Estonia, April 25, 2017. The F-35s are participating in their first-ever flying training deployment to Europe and this forward deployment to Estonia allows Airmen to better understand NATO's current infrastructure and strengthens interoperability with Allies. ( Air Force Photo/Senior Airman Christine Groening)

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Photo credit: © PJF Military Collection / Alamy / Afripics
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