history · 13 May 1942 · 82 years ago
Joseph Rochefort's cryptanalytic team in Pearl Harbor, US Territory of Hawaii intercepted a radio message of Japanese warships requesting navigation charts of the Oahu, Hawaii area. Some time later, the team intercepted a message ordering aircraft transport ship Goshu Maru to embark the seaplane unit at Emidj island, Jaluit Atoll, Marshall Islands and sail to Saipan, Mariana Islands to join the AF campaign. Realizing that AF must already have a seaplane base or was a good location for a future seaplane base, Rochefort further confirmed that AF was Midway Atoll. Later in the evening, he sent this report to Chester Nimitz and the naval leadership in Washington DC, United States.
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