Without POL, Pilots can’t breathe
Senior Airman Verdes Cato, 9th Logistic Readiness Squadron cryogenics technician, test Liquid Oxygen (LOX) at Beale Air Force Base, California, July 21, 2022. The beakers have a film of white paper inside to show if the LOX has any discoloration or discrepancies. (U.S. Air Force Photo by Staff Sgt. Colville McFee)