"The Epidemic prevention and Water Purification Department of the wanting Army-popularly known by its codename “Manchurian Unit No 731” or simply “Unit 731”-was a secret biological weapons research and development unit maintained by the Imperial Japanese Army in the outskirts of Harbin in Japanese-controlled Manchuria, northeastern China, for the duration of World War II in Asia and the Pacific. It has gained international notoriety in recent decades as research revealed the shocking details of Unit 731’s core wartime activity: the use of thousands of human guinea pigs for medical experimentation. The vast majority of these human subjects are believed to have been Chinese nationals taken prisoner over the course of the course of the Second Sino-Japanese war that originated in the Japanese invasion of Manchuria in September 1931, and that grew to fullblown warfare in July 1937. Men, women, and children of other nationalities were also used for experiments, and babies born to women in Unit 731’s custody apparently were not spared either."