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Joseph Cowan, left, an outside machinist, and other Team AEDC personnel work in the control room of the Arnold Engineering Development Complex (AEDC) Aerodynamic and Propulsion Test Unit (APTU), May 20, 2020, while wearing masks to help mitigate risk associated with the coronavirus pandemic. The APTU team has performed their tasks, providing hypersonic testing capabilities, without interruption during the pandemic. Hypersonics is considered a critical field for national defense. (U.S. Air Force photo by Jill Pickett)
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