Staff Sgt. Kajuan Green, 51st Logistics Readiness Squadron cryogenic storage supervisor examines liquidized oxygen at Osan Air Base, Republic of Korea, Dec. 1, 2022. When conducting a quality control test, Green looks for unwanted particulate matter and the presence of any unusual smells to ensure the oxygen is at a standard level of purity (U.S. Air Force photo by Staff Sgt. Dwane R. Young)