This doesn't make sense. Japan's post-war constitution prohibits their deployment of troops outside their borders. Where were these Japanese soldiers deployed, and when?
Japan's constitution didn't come about until sometime after the war ended, in either 1947 or early '48.
See anon's answer below; Japanese troops were used at wars end as "colonial" policemen for the areas colonial powers, Britain and France as the main colonial powers in South east Asia.
These colonies, wanted independence and at wars end saw their opportunity to achieve this. So the allies used what was available to them and offered the Japanese soldiers a job. The Japanese soldiers were used because they were good professional soldiers with a reputation and they were exactly what was needed in order to keep these colonies in line and to keep them as colonies.
He's referring to the Allies' use of POW Japanese soldiers as "policemen" in far east colonies immediately after the war.
The European allies had promised independence to their many colonies in Asia if they would come and save their asses in the war against the Axis.
Post-war they wanted to renege on the promise. Since their troops were few and scattered, they resorted to using POW Japanese soldiers to maintain colonialist control.
That's why there was a Vietnam War.
Thank-you anon for answering the question.