Tojo was a high ranked general in the Imperial Japanese Army. He allowed for the use of Unit 731 weapons in the Imperial Army of Japan. Koizumi pleaded with Tojo for more funding for Unit 731, which Tojo agreed to and granted Shiro Ishii 10 million Japanese yen for continued experimentation. However, Tojo rejected the use germ warfare against United States because he believed that "Biological assaults on the United States would invite retaliation with germ or chemical weapons being developed by America."
Encounter with the United States
General Hideki Tojo was one of the only people associated with Unit 731 that was tried and found guilty of inhumane treatment of POWs. However, his guilty verdict was not related to his interactions with Unit 731.