Willoughby was the Chief of Intelligence on General MacArthur 's staff during World War II , the occupation of Japan , and the Korean War . Willoughby became a major general on 12 April 1945 . Due to his initiative at the end of the Pacific Campaign war crimes charges against Shirō Ishii were dispensed with in exchange for information gathered by Unit 731 , a covert biological and chemical warfare research and development unit of the Imperial Japanese Army that undertook lethal human experimentation in China . Additionally there was a monetary reward for Ishii
Unit 731
Unit 731
Charles A. Willoughby