I don’t think the jungle fatigues were worn past Vietnam. If you want pre-BDU '80s troopers, i.e. OG107 Fatigues, I think a better starting place is the newish Tamiya US Infantry Scout Set (35379).
By changing out the boots w/straight leg boots and reworking the suspenders into H-style, adding new ammo pouches and M16A1s w/30 magazines, adding helmets w/covers and you will have figures in what will pass for OG107 Fatigues in field jackets and field gear. For '70s figures, just use M14s. That is what I plan for figures in '70s - '80s OG-107 Fatigues anyways.