Even if they did, I really doubt that they EVER had a B-70 bomber. We had two and were ready for production, and probably would have put an end to the Cold War.
...and then JFK was elected.
Uh...hate to tell you, but the XB-70 came to being AFTER Kennedy was elected. (First flight Sept. 21, 1964)
Had multiple problems which seemed to get worked out. It could do as advertised and hit Mach 3. What truly killed it was the mid-air accident that killed a chase plane pilot and one of the Valkyrie pilots.