Air Force Master Sgt. Michael Guderyon, assigned to the 307th Maintenance Squadron, checks the maintenance log of a B-52 Stratofortress at Barksdale Air Force Base, Louisiana, March 3, 2018. As a Reserve Citizen Airman, he serves as a structural maintenance mechanic and on the civilian side, Guderyon is a doctoral student doing research using stem cells to find cures for more than 25 different diseases. ( Air Force

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Photo credit: © PR Collection / Alamy / Afripics
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