Question: What month did the unit of the Imperial Japanese Army that undertook lethal human experimentation during the Second Sino-Japanese War got pardon?
Sentence (from "American cover-up of Japanese war crimes"): The pardon of Japanese war criminals, among whom were Unit 731's commanding officers General Shiro Ishii and General Masaji Kitano, was overseen by General of the Army Douglas MacArthur in September 1945.
Relevant evidence: Yes