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Rob Hale, engineering technician, left, Parth Kathrotiya, system engineer, center, and Zack Russo, engineering technician, pose with the Mach 18 nozzle at AEDC Hypervelocity Wind Tunnel 9 in White Oak, Maryland, March 22, 2019. (U.S. Air Force photo by A.J. Spicer) (This image has been altered by obscuring badges for security purposes)
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