Airman Derek Nelson, 99th Logistics Readiness Squadron fuels mobile distribution operator, monitors levels of liquid oxygen in a cryogenic storage tank at Nellis Air Force Base, Nev., March 17, 2015. Cryogenics is one of the many liquids for which the 99th LRS petroleum, oil and lubricants flight is responsible. (U.S. Air Force photo by Airman 1st Class Mikaley Towle)
Airman 1st Class Mikaley Towle
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