All TKD has combat potential but today it has come down to sport, trophies and competition. In Vietnam era, there were quite a few small unit teams that trained in TKD. I am not saying they do not train that way today but the exercise and sport is predominant. There were a few Korean actors who were in Vietnam and one of them come to mind is Hwang JangLee! If I remember correctly the group was called the Tiger Division! (If my recall is accurate )