companions rather than as research subjects made him notable to the staff of the university. He did not get along well with his classmates; they would become infuriated as a result of his "pushy behaviour" and "indifference". One of his mentors, Professor Ren Kimura, recalled that Ishii had an odd habit of doing his laboratory work in the middle of the night, using laboratory equipment that had been carefully cleaned by his classmates earlier. His classmates would "really be mad when they came in and found the laboratory equipment dirty the next morning". In 1925, Ishii was promoted to Army Surgeon, Second Class (surgeon captain). Biological warfare project By 1927, Ishii was advocating for the creation of a Japanese bio-weapons program, and in 1928 began a two-year tour of the West where he did extensive research on the effects of biological warfare and chemical warfare developments from World War I onwards. Ishii's travels were highly successful and helped win him the patronage of Sadao Araki, the Japanese Minister of the Army. Ishii also received the backing of Araki's ideological rival in the army, Major-General Tetsuzan Nagata, who was later considered Ishii's "most active supporter" at the Khabarovsk War Crime Trials. In January 1931, Ishii received promotion to Senior Army Surgeon, Third Class (surgeon major). According to Ishii's followers, Ishii was extremely loyal to the Emperor and had an "enthusiastic personality" and "daring and carefree attitude", with eccentric work habits such as working late at night in the lab after hanging out with friends at town. He was also known for his heavy drinking, womanizing and embezzling habits, which were tolerated by his colleagues. Ishii was described as a vehement nationalist, and this helped him gain access to the people who could provide him funds. In 1935, Ishii was promoted to Senior Army Surgeon, Second Class (surgeon lieutenant-colonel). On August 1, 1936, Ishii would be given formal control over Unit 731 and its research facilities. In these facilities Ishii and his men would perform experiments on live humans, including but not limited to: infecting living subjects with plague rats, forced pregnancies, vivisections (often conducted without anesthesia), and inducing frostbite and trying to cure it. A former member of Unit 731 recalled in 1998 that when he first met Ishii in Tokyo, he was surprised at his commander's appearance: "Ishii was slovenly dressed. His uniform was covered with food stains and ashes