Kinzo wasn't involved as a soldier in that war.
U.S.A. however had many bases in japan and used them as strategic points during the korean war.
Since Kinzo had deep connection within the american forces, he managed to take advantage of the situation to gain a lot of money. That's probably related with supplies and so on.
The details of how that happened aren't described, but that's how Kinzo was involved in that war. He definitely never went there to fight nor to command any squad anyway.
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