Master Sgt. Mark Smith, 351st Air Refueling Squadron boom operator, checks a set of omni-rollers during an annual cargo evaluation check ride, at RAF Mildenhall, England, Jan. 16, 2020. Cargo check rides involve an inspection inside and outside the aircraft making sure all loads are balanced and secured properly. The omni-rollers are wheels that produce the least amount of friction possible by moving in all directions, to allow smooth loading and unloading. ( Air Force photo by Senior Airman Alexandria Lee)

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Size: 1936px × 1291px
Photo credit: © Operation 2021 / Alamy / Afripics
License: Licensed
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