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I don't know the facts in this specific case as I'd not heard of it before but it's quite likely that those messages you refer to were passed direct to the Japanese section at Bletchley Park for deciphering. As I pointed out earlier, this included a large American contingent. I only discovered this during my recent visit as it was never common knowledge. Everything done at Bletchley during WWII was classified as Top Secret & some still is today. Lack of knowledge of what was actually achieved there (like the development of the first electronic computer) has led to many misconceptions since the war. All equipment & documents were destroyed soon after the end of WWII to prevent it falling into the hands of a potential enemy. I don't expect this is unique by any means & there are some things that will never be revealed, at least during my lifetime.

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Woody. I should remind you that this was a combined operation. The invasion & liberation of Europe would have been impossible without the considerable contribution of American forces & equipment and I imagine intelligence. It's quite natural that any intelligence would be passed on to the appropriate area without worrying if this happened to be American or British or even Russian if affected them. It's also quite likely that those Japanese messages were deciphered at Bletchley Park as this was in the area involved & also the centre of Allied codebreaking throughout WWII. The intelligence belonged to the Allied effort & not one country & I suspect it was all passed through the same chain of command to whoever was responsible for distributing it.

I realise that inter-service rivalry caused a lot of problems during WWII & have no doubt this also applied to international cooperation but it would have been so much easier without these petty squabbles. We were all on the same side.

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There were two very good reasons the Americans came to Bletchley Park. First the establishment was already set up with the most advanced equipment available for deciphering coded messages. There were probably a lot more Japanese speakers in America (including Japanese Americans) than in Britain or anywhere except Japan. This would obviously be a big advantage in deciphering Japanese codes as they would not have to learn a very complex & difficult language in order to understand what they were doing. The establishment was not set up on a national basis & people from many different nationalities worked alongside each other to achieve a common aim. The defeat of the enemy. This was a great achievement & fine example of international cooperation.

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Indeed & this is often forgotten or not realised.

It's also not commonly known that the British & other governments were offered the Enigma machine soon after it was first invented but turned it down as they saw no practical use for it. It was originally intended for commercial use against industrial espionage & available to any large company. Only the Germans took advantage of it for military use.