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I don't know much about the history of breaking Enigma but this appears to be well documented and should be a worthy milestone. A comment: There is no indication of WHERE this activity took place. The first sentence of the citation seems a bit terse. Could it start with, "Near this site..." or "At such-and-such location..."? I think it would be more meaningful to the reader.
I agree with Lyle and believe that this achievement is worthy of being an IEEE Milestone.
It helped speed the end of WWII. Not sure that it ended WWII with American assistance.