Air Force Chief Master Sgt. Terrence Greene, right, Air Mobility Command command chief, and Chief Master Sgt. Derek Crowder, left, 60th Air Mobility Wing command chief, use laser etching technology to write on metals 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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