Staff Sgt. Luke Brackin and Airman 1st Class Mark Sherwood service an aircraft with liquid oxygen Jan. 13, 2014, at Hurlburt Field, Fla. Aircraft are filled with LOX to provide air for personnel on board. Brackin and Sherwood are crew chiefs with the 1st Special Operations Aircraft Maintenance Squadron. (U.S. Air Force photo by Senior Airman Krystal M. Garrett/Released)
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