>>It gets even weirder when there appeared to be a conspirational effort to destroy every trace of the program; including all plans and the even the five test aircraft themselves.
I don’t think “conspirational” is even a real word?
How about constipationitorial?
I’m betting 99% of the reason was to keep the research out of Russian hands. The Arrow was designed to intercept Russian bombers coming in over the remote regions of the arctic.
At that very moment, we thought -we- might need to send bombers into Russia over some very remote regions of the arctic. We didn’t want our B-52s and B-58s to run into a Russian Avro Arrow clone. Remember the Soviets copied everything they could back then, so that was a very real possibility. And the Arrow was almost -purpose built- to defend the USSR against SAC bombers.
It would have been like a very high quality MiG-25.