To the day he died, he maintained that someone at the top knew something bad was about to happen in Hawaii. He was transferred to the ETO in 1944.
I'll try to find the book, thanks.
Diplomatic code and Purple (operational)code were not the same. Also, as in Germany, our intel was always reluctant to indicate to the enemy that we did have their code, ie. “Enigma” machine, we had to appear lucky.
Which would correspond to U.S. forces going off high alert due to a belief that an attack would not occur while Japanese diplomatic efforts were underway in Washington DC.