In 1945, a Japanese scientist named Shiro Ishii devised a plan of attack on civilians in the United States called Operation PX, also known as Operation Cherry Blossoms at Night. The plan was intended to wage biological warfare upon civilian population centers in the continental United States during the final months of World War II. The plan was devious, and heinous. Ishii planned to spread plague-infected fleas over Southern California using airplanes. The original operation was abandoned shortly after its planning on March 26, 1945. Then, with modifications, it was finalized and placed back of the table to be carried out. The plan was to be carried out on September 22nd, 1945. Unfortunately for Japan, their formal surrender date was August 15th, 1945, and the war was over.
Originally, the Japanese Naval General Staff, led by Vice-Admiral Jisaburi Ozawa proposed Operation PX in December 1944. The code name for the operation came from the Japanese use of the code name PX for Pestis bacillus-infected fleas. The navy partnered with Lieutenant-General Shiro Ishii of Unit 731. Ishii possessed extensive experience on weaponizing pathogenic bacteria and human vulnerability to biological and chemical warfare, and he was an extremely evil man, willing to use his knowledge for the murders of millions of people, especially if he thought it would bring him more power.
In Ishii’s plan, they would use Seiran aircraft launched by submarine aircraft carriers upon the West Coast of the United States, targeting specifically, the cities of San Diego, Los Angeles, and San Francisco. The attack was to be utilizing weaponized bubonic plague, cholera, typhus, dengue fever, and other pathogens in a biological terror attack upon the population of the United States. The original plan was to have the submarine crews infect themselves and run ashore in a suicide mission. When the operation was shelved in March of 1945, it was because Umezu could see the future ramifications, and conveyed as much, when he said, “If bacteriological warfare is conducted, it will grow from the dimension of war between Japan and America to an endless battle of humanity against bacteria. Japan will earn the derision of the world.”
The idea of suicide attacks was tabled, due to opposition from Yoshijiro Umezu and Torashiro Kawabe, who did not want Ishii to die in a suicide attack and asked him to instead “wait for [the] next opportunity calmly”. It was then that Ishii devised a final plan using of the biological weapons and fleas…an attack that never took place either. The world never knew of the planned attack until long after the war, when Operation PX was first discussed in an interview by former captain Eno Yoshio, who was heavily involved with planning for the attack. He first spoke of it in an interview with Sankei on August 14, 1977. According to Yoshio, “This is the first time I have said anything about Operation PX, because it involved the rules of war and international law. The plan was not put into actual operation, but I felt that just the fact that it was formulated would cause international misunderstanding. I never even leaked anything to the staff of the war history archives at the Japanese Defense Agency, and I don’t feel comfortable talking about it even now. But at the time, Japan was losing badly, and any means to win would have been all right.” That interview goes to show how horrible some regimes can be.