Unit 731. May 5, 1945.
The personnel behind the unit went relatively unpunished as General Douglas MacArthur and the US Joint Chiefs of Staff secured their immunity from retribution in exchange for vast amounts of documentation of research conducted (upon Chinese civilians) into biological warfare, which proved useful to the US military.
The Other Holocaust: Nanjing Massacre and Unit 731
Vivisection of American POWs Germ Warfare Timeline More More