Master Sgt. Joe Feiss, 455th Expeditionary Logistics Readiness Squadron petroleum, oils and lubricants lead supervisor, pours liquid oxygen into a beaker at Bagram Airfield, Afghanistan, Nov. 27, 2018. The POL team provides about 5,000 gallons of liquid oxygen to various aircraft such as the F-16 Fighting Falcon. (U.S. Air Force photo by Senior Airman Kaylee Dubois)