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John Hile, center, an Arnold Engineering Development Complex (AEDC) test engineer, speaks with Maj. Gen. Evan Dertien, commander, Air Force Test Center, about the use of arc heaters, such as the one seen in the background, for characterizing and evaluating thermal protection systems at Arnold Air Force Base, headquarters of AEDC, Oct. 13, 2021. Also pictured is Frank Wonder, arcs capability manager. (U.S. Air Force photo by Jill Pickett)
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