The inside of the Containerized Vacuum System (CVS) at Arnold Engineering Development Complex Hypervelocity Wind Tunnel 9 is shown. The primary purpose of the CVS is to reduce pressure in the Vacuum Sphere to levels at which test operations can be performed. The CVS was installed at Tunnel 9 late last year to fill in for a compressor that went down in the Tunnel 9 Vacuum Compressor Plant. (U.S. Air Force photo by Nicholas Fredrick)