In the late 1950s, the North American XB-70 Valkyrie looked like it had been ripped straight out of the pages of a science fiction comic book. With a sharp, angular design, six afterburning engines, and the latest targeting, navigation, and electronic warfare systems America could muster, the XB-70 was to become the world’s biggest, fastest, and highest-flying bomber in history… Until it wasn’t.

Lockheed's YF-12 - The SR-71's missile packing sister:    • YF-12: The SR-71's missile-packing si...  

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