Check Six: North American Aviation XB-70A Valkyrie Roll Out – 56 years ago
From the This Day in Aviation website

11 May 1964: At Air Force Plant 42, Palmdale, California, the first prototype North American Aviation XB-70A-1-NA Valkyrie, 62-0001, was rolled out. More than 5,000 people were there to watch.
In August 1960, the U.S. Air Force had contracted for one XB-70 prototype and 11 pre-production YB-70 development aircraft. By 1964, however, the program had been scaled back to three XB-70s. Only two of these would actually be completed.
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