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Staff Sgt. Bob Kohlenberg, 40th Helicopter Squadron instructor flight engineer, pulls the intake plug on the number two engine of a UH-1N helicopter during a pre-flight check at Malmstrom’s helicopter squadron Aug. 11. Protective equipment like these engine plugs ensure that Malmstrom’s aircraft are ready to fly at a moment’s notice and are always protected from the elements. (U.S. Air Force photo/Airman 1st Class Collin Schmidt)
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