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AFRL engine, hearing protection technology at Air Force museum
Major Gen. (Ret.) Charles D. Metcalf (left), director of the National Museum of the United States Air Force, accepts hearing protection and communications technology from test pilot Pete Siebold of Scaled Composites, LLC. Siebold wore the Attenuating Custom Communications Earplug System (ACCES) while piloting a modified Long-EZ aircraft powered by a pulse detonation engine developed by AFRL’s Propulsion Directorate. (U.S. Air Force photo/Chris Gulliford)
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