Tech. Sgt. Alexander Sasser, 379th Expeditionary Logistics Readiness Squadron fuels cryogenics NCO in charge, signs paperwork after weighing a 400-gallon liquid oxygen tank in preparation of an aircraft shipment Aug. 5, 2016, at Al Udeid Air Base, Qatar. The 379th ELRS maintains three large storage tanks that contain liquid oxygen and liquid nitrogen along with 51 liquid oxygen and liquid nitrogen carts that ship daily to other bases throughout the U.S. Air Forces Central Command’s area of responsibility. (U.S. Air Force photo/Senior Airman Janelle Patiño/Released)