End of WW2For five years during World War II, Indochina was a French-administered possession of Japan. On Sept. 22, 1940, Jean Decoux, the French governor-general appointed by the Vichy government after the fall of France to the Nazis, concluded an agreement with the Japanese that permitted the stationing of 30,000 Japanese troops in Indochina and the use of all major Vietnamese airports by the Japanese military. The agreement made Indochina the most important staging area for all Japanese military operations in Southeast Asia.