U.S. Air Force Staff Sgt. Kennie Delmo, left, a cryogenics supervisor and Senior Airman Samuel Fallot, a cryogenics journeyman with the 379th Expeditionary Logistics Readiness Squadron, Fuels Management Flight, review their checklist at Al Udeid Air Base, Qatar, Aug. 9, 2017. Delmo and Fallot are preparing a cryogenic sampler to receive a sample of liquid oxygen so it may be transported safety to the lab for quality- testing before it is sent to other locations throughout the U.S. Air Forces Central Command area of responsibility. (U.S. Air Force photo by Tech. Sgt. Amy M. Lovgren)