Hypervelocity Tunnel 9 celebrates a historic milestone this month
Hypervelocity Wind Tunnel 9 staff looks on as the test crew executes run 4000 in 2015. October marks the 20th anniversary of the Hypervelocity Wind Tunnel 9 as an Air Force facility. (U.S. Air Force photo/A.J. Spicer)

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Photo by: Photo by Arnold S. Collier |  VIRIN: 150108-F-BK283-544.JPG