Re: Vietnam 10 ga
No, no military records or personel files recorded weapons issue. There are freaks and experimental guns but the mililtary does not issue one-off toys; military weapons are tested and standardized, and generally the use of non standard weapons and ammunition is prohibited (though in some areas that has not always been enforced).
I know for a fact that as time goes by and memories get hazy, stories get "improved".
P.S. Did I ever tell you how I captured Adolf Hitler and Napoleon on the same raid into China in 1620?