Perhaps the most important such lesson learned by the US had to do with its own soldiers. The US learned that morale was of paramount importance and that the draft was a bad thing.
In the Vietnam War, the soldiers’ morale eventually came to be very poor. This was partly because of the fact that so many soldiers had been drafted and had no desire to be in the war. The military started to do more to try to protect morale. It has also come to be extremely opposed to any suggestion that the draft should be reinstated. This is a social or cultural lesson that came out of the Vietnam War.