Or put simply, Turbonium, "Intercepting" a message just means that the Army used radio antennas to capture the transmissions (when encoded, a secret message appears to be a random string of numbers) and wrote down the coded message. That doesn't mean that the Army codebreakers were able to understand JN-25 messages.

There are good reasons to write down every coded transmission you can catch. Codebreakers can't break a code without having a sample of an encrypted message. The more messages they can lay their slide-rules on, the more likely they can break the code by identifying patterns in the apparant randomness.

So "intercepted" means they heard it. I could intercept a Japanese conversation today. Doesn't mean I would understand it because I don't speak Japanese.

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