On Sun. 18 Jan 1942 Joseph Rochefort's cryptanalytic team in US Territ.....
Joseph Rochefort's cryptanalytic team in US Territory of Hawaii intercepted Japanese Navy radio messages that mentioned an invasion or occupation force against a target code named "R", which Rochefort guessed was Rabaul, New Britain. He would pass this information to Chester Nimitz via Edwin Layton Facility
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