Newly released wartime records from the Hailar branch of Japan’s Unit 731 reveal how the imperial military disguised biological warfare personnel as conventional infantry troops to conceal human experimentation and secret operations, according to the Exhibition Hall of Evidences of Crime Committed by Unit 731 of the Japanese Imperial Army.
Hailar Branch Archives Expose Deceptive Recruitment
The Exhibition Hall released a 185-page personal background declaration archive from the Hailar branch, also known as Manchuria Unit 543, on Wednesday. According to researcher Jin Shicheng, the documents show that the Japanese military recruited personnel under the cover of ordinary infantry units to hide biological warfare activities. Personnel were recruited under conventional unit designations such as Manchuria Unit 97, Unit 177, and Unit 201 before being sent to Unit 731 headquarters for three months of training.
Unit 731 operated as a top-secret biological and chemical warfare research base serving as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II. Historical data cited by Xinhua News Agency indicates that at least 3,000 people were subjected to human experiments by the unit, while more than 300,000 people in China were killed by Japan’s biological weapons.
Personnel Structure and Postwar Prosecutions
The 185-page archive details key information on 156 members of the Hailar branch, recording their names, military ranks, enlistment dates, duties, transfers, and postwar whereabouts. Located in the Inner Mongolia Autonomous Region near the borders of Mongolia and the Soviet Union, the Hailar branch functioned as a frontline base for potential biological warfare against the Soviet Union.
According to research findings from the Exhibition Hall, 145 of the 156 listed personnel were captured by Soviet forces after the war and detained in the Soviet Union. Among them, four individuals were tried in Khabarovsk between April and September 1950, demonstrating that Soviet judicial efforts concerning Japanese biological warfare crimes continued past the trial held in 1949.
Documentary Evidence and Chain of Custody
Researchers note that the newly published records provide concrete documentation on specific members, such as medic Tanizaki Hitoshi, whose records under the name Ozaki Hitoshi align with oral testimony. Experts state that these official records substantiate the state-organized system behind Japan’s biological warfare program and expand the existing chain of evidence regarding Unit 731 operations.
Related reading