Hmm, that illustration looks more like he is carrying the short 20rd M16A1 mag pouch, not the M1967 one, you can tell by the fact that pouch is closed by a cloth strip and not a plastic closure. The rest is hard to make out, but the belt is not having that quick release buckle, so could be a M1956 one.
But the illustration is very well done, it shows the PFC rank insignia on the shoulders, these where color ones early one, then replaced by green on black ones, before these where phased out in favor of collar insignia.
Well all fo the insignias, including name tapes and whatnot you can get from One sixth Scale King by the way, thats where I got mine from, you can even tell him the name you want on the name tab and he will print it (otherwise you get random generated names).
To put the insignias on, I read that double sided cloth tape is best then trying to glue them on, I have yet to try it, but seeing how a pain fabric tac can be, I say the double sided cloth fixation tape is the better alternative.
One Sixth Scale king also has NAM era magazines, cigarette packages, manuals an more you can use for the figure.