That beautifully typed (by whites) letter in your link indicates that on March 1, 1943 we were intercepting a significant amount of German communications. When you layer that on top of the fact that we were deciphering Japan’s communications much earlier (early enough to have had forewarning of PearlHarbor) it would appear that Roosevelt was working in an environment that we might refer to as “total information awareness.”
This has massive implications. It would appear that we were not “Fighting” a war with Germany. We were “Directing” a war with Germany.
It rewrites the whole narrative of World War II to some extent. Perhaps that is why it was kept secret.
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