Staff Sgt. Sarah Sarten uses valves to control the pressure of liquid oxygen while filling a cart at the 379th Air Expeditionary Wing in Southwest Asia, Oct. 1, 2013. Cryogenics technicians work with “compressed gases,” distributing them as needed to support missions throughout the entire U.S. Air Forces Central Command area of responsibility. Sarten is the 379th Expeditionary Logistics Readiness Squadron cryogenics supervisor deployed from Scott Air Force Base, Ill., and a Concord, N.C., native. (U.S. Air Force photo/Senior Airman Bahja J. Jones)