![XB-70 taking off.](https://www.nasa.gov/wp-content/uploads/2023/03/359356main_ECN-792_full-1.jpg)
Where Are They Now: XB-70 #1
The B-70 Valkyrie, with a planned cruise speed of Mach 3 and operating altitude of 70,000 feet, was to be the ultimate high-altitude, high-speed manned strategic bomber.
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https://www.nasa.gov/image-detail/where-are-they-now-xb-70-1/
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