Good thing the most well funded military in the world, greater than the next 9 nations combined, is also at their beck and call. This isn't the NVA, this is a bunch of 280 pound guys who practice shooting from benches, going against drones, artillery, bombers, tanks, missiles, etc.
One of the fattest countries in the world aren't hardened fighters after years of various occupations. Vietnam, Afghanistan, Iraq etc. is not comparable to the US and Texas