After the outbreak of the Second Sino-Japanese War in 1937 , SINAW factories were severely damaged by Japanese aerial bombing . Nanchang was later occupied by the Imperial Japanese Army , which used Laoyingfang as an air base . It was likely from Laoyingfang that the Unit 731 launched germ warfare against the city of Changde in nearby Hunan province
Unit 731
Unit 731
Nanchang Laoyingfang Airport