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A B-52 Stratofortress on the Minot Air Force Base, N.D., flightline fires up its engines before daybreak Jan. 30 during a test to measure the difference between JP-8 fuel and a new synthetic fuel. The testing of synthetic fuel in cold weather is the last step in the certification process to help reduce Air Force dependence on imported fuel. With added wind chill, Minot experienced temperatures of minus 25 degrees on this day.
U.S. Air Force photo/Airman 1st Class Christopher Boitz