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According to Rochefort, three Japanese Navy officers were quick to use proviso number two: the admirals in command of the forces attacking Hawaii, Wake, and Guam. In a secret report to Admiral Husband Kimmel, Commander-in-Chief of the Pacific Fleet, dated 25 November, Rochefort reported the three talkative admirals were in :extensive communication" with one another. One of them was Vice Admiral Chuichi Nagumo, commander of the Hawaii raid. The two others were Vice Admiral Mitsumi Shimizu, head of Japan's submarine fleet, and Vice Admiral Shigeyoshi Inoue, commander of Japan's Pacific Invasion forces. In their "extensive communication" on board their flagships, the talkative commanders compromised their security.
They were heard throughout the Pacific Ocean by U.S. Navy cryptographers and the ocean liner SS Lurline. Radio direction finder bearings were obtained by U.S. Navy monitor stations at Dutch Harbor in Alaska, Trinidad, and Half Moon Bay California. according to intelligence officers of the 12th Naval District, Captain A. James McCollum and Commanders Robert Ogg, A. William Barkan, and Charles Black. According to these officers, Commander Jacobsen¬ never contacted or interviewed them concerning the reports.
U.S. Navy records compiled by by Station H confirm the monitor stations were assigned Japanese warship direction finder coverage by naval officials in Washington D.C., in summer 1941.