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EIELSON AIR FORCE BASE, Alaska -- Airman First Class Andrew Tuttle (left) and Staff Sgt Kyle Evans, 354th Logistics Readiness Squadron, purge the Liquid Nitrogen (LIN) tube to clear any impurities that may have settled since its last use. The plume is the result of burnoff and the extremely low boiling point of the LIN.
(U.S. Air Force Photo by Staff Sgt Joshua Strang)