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"hosho" - 1 õppematerjal

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TheCodeBreakers

On the same day that Layton gave his report to Kimmel, the Office of Naval Intelligence produced a memorandum of "Japanese Fleet Locations" that Layton, when he saw it, considered as "dotting the i's and crossing the t's" of his own estimates. It placed Akagi and Kaga (Carrier Division 1), and Koryu and Kasuga in southern Kyushu waters, and Soryu and Hiryu (Carrier Division 2) and Zuikaku, Shokaku, Hosho , and Ryujo at the great naval base of Kure. All this was just a more precise way of saying "home waters." These estimates were based on the November observations. The call- sign change of December 1 obliterated the intricate communication networks that the radio intelligence units had so painstakingly built up and forced them to begin anew. The Japanese bedeviled them with new communication-security measures. Dispatches were sent “on the umbrella"—broa...

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