2nd Lt. Lindsey Mueller, 354th Logistics Readiness Squadron flight commander, looks through the window of a petroleum boiler at the flames that heat crude oil to more than 600 degrees while touring a local refinery in North Pole, Alaska, April 21, 2015. The refinery hosted the group to show how crude oil is processed into the JP-8 fuel the base uses for its missions. (U.S. Air Force photo by Staff Sgt. Shawn Nickel/Released)
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