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You're right it's not mil issue, but otherwise I could believe this one, it certainly looks like a jacket of that age and as they spent a lot of time in this part of the world coming and going it's not impossible that it might be a pp. The patch appears to be original as well, but i'm no expert.
This makes good reading. http://kalaniosullivan.com/KunsanAB/8th ... ml#Pursuit