U.S. Air Force Tech. Sgt. Jason Flowers, 325th Logistics Readiness Squadron noncommissioned officer in charge of fuel distribution, conducts a quality control test on liquidized oxygen at Tyndall Air Force Base, Florida, Dec. 7th, 2021. When conducting a quality control test, Flowers looks for unwanted particulate matter and the presence of any unusual smells to ensure the oxygen was at a standard level of purity. (U.S. Air Force photo by Airman 1st Class Anabel Del Valle)