Airman 1st Class Carl Eslava, a fuels specialist assigned to the 99th Logistics Readiness Squadron (LRS) gives a thumb up during a rapid crew swap refueling at Nellis Air Force Base, Nevada, Dec. 19, 2019. Fuels specialists are responsible for operating vehicles, equipment and storage facilities that are essential to refueling operations while ensuring the compliance of safety regulations. (U.S. Air Force photo by Airman 1st Class Dwane R. Young)
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