Air Force Senior Airman Samuel Ralphs, left, 6th Air Refueling Squadron boom scheduler, shows Chief Master Sgt. Terrence Greene, right, Air Mobility Command command chief, a simulation of a KC-10 Extender refueling Jan. 10, 2020, at Travis Air Force Base, California. Greene visited Travis to gain a better understanding of how the base enhances the rapid global mobility mission. ( Air Force Airman 1st Class Cameron Otte)

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Photo credit: © Operation 2021 / Alamy / Afripics
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