![](http://www.alamy.com/thumbs/6/CEC3029C-2912-4215-989B-EBF148701D14/M3WNX8.jpg)
After the SR-71 program was cancelled, the Air Force loaned NASA three aircraft for high-speed and high-altitude aeronautical research. (NASA photo) SR-71B - Mach 3 Trainer in Flight at Sunset by AirmanMagazine
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Photo credit: © Military Collection / Alamy / Afripics
License: Licensed
Model Released: No
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