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U.S. Air Force Senior Airman Jesse Carlson and Airman 1st Class Donald Selmer, 133rd Maintenance Group, conduct engine repairs in Yuma, Ariz., Feb. 23, 2021. Carlson and Selmer are taking part in Operation Snowbird, a training exercise for the 133rd Airlift Wing that enhances the ability to deploy, execute, and sustain rapid global mobility worldwide. (U.S. Air National Guard photo by Tech. Sgt. Nicholas Warren)