Air Force Senior Airman Christoffer Horner, 909th Aircraft Maintenance Unit KC-135R crew chief, performs a gravity feed operation check Jan. 25, 2018, at Kadena Air Base, Japan. KC-135R Stratotanker crew chiefs look for discrepancies such as leaks, smoke or damage during a power-run. ( Air Force

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Photo credit: © RP Library / Alamy / Afripics
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