Masaji Kitano was what rank when Unit 731 carried out the most notorious war crimes in Manchukuo?
Masaji Kitano:  He was the second commander of Unit 731, a covert biological and chemical warfare research and development unit responsible for some of the most notorious war crimes carried out by Japanese personnel. Unit 731:  Unit 731 was based at the Pingfang district of Harbin, the largest city in the Japanese puppet state of Manchukuo (now Northeast China).
second commander