Operation PX was the codename for the Japanese plan for a biological terror attack on the U.S. west coast in World War 2. The planned operation was abandoned due to the strong opposition of Chief of General Staff Yoshijirō Umezu, as well as the Japan surrender following the atomic bombings and the Soviet declaration of war.
Operation PX, also known as “Cherry Blossoms at Night” was proposed in December 1944 by the Japanese Naval General Staff, led by Vice-Admiral Jisaburō Ozawa. The name for the operation came from the Japanese use of the code name PX for Pestis bacillus-infected fleas.
In planning the operation, the navy partnered with Lieutenant-General Shirō Ishii of Unit 731, who had extensive experience on weaponizing pathogenic bacteria and human vulnerability to biological and chemical warfare.
The plan for the attack involved Seiran aircraft launched by submarine aircraft carriers upon the United States West Coast…
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