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Japanese Attack on Pearl Harbor in 1941
INTRODUCTION
• Surprise military strike on December 7, 1941• World War II• Preventive action • Neutralize the U.S. Pacific Fleet
INTELLIGENCE ARCHITECTURE/SYSTEM
• MAGIC– Army and Navy– Able to decode Japanese communications
• Radio traffic– Navy intelligence unit at Pearl Harbor– Able to detect and analyze location of
Japanese ships– Derive force composition and location of
Japanese Fleet through NTTI
INTELLIGENCE ARCHITECTURE/SYSTEM
• American embassy in Japan– Ambassadors’ report provide insight of
Japanese intentions and attitudes– Reflected Japanese people attitude towards
war and hostility towards the US
• Other sources– Allies provide intelligence on Japan and Far
East