"The Vietnam War is behind us but not entirely forgotten. Like our Civil War, Vietnam holds a fascination for many Americans, and I suspect that this will grow rather than diminish as research continues and new works are published about the war. For the older military professionals who served during the Vietnam War and for the still older career military men who were perplexed by it, my advice is to look at Vietnam in a broader historical perspective. For the young military professional who did not serve in Vietnam, my advice is to learn all you can about the war and try to understand it. Finally for those military men now serving at the top military positions, as well as those who will rise to those positions later, my advice is to do all you can to improve the civilian-military interface in the highest councils of our government. This is the best way I know to better the chances that our civilian leaders truly understand the risks, costs, and probable outcomes of military actions before they take the nation to war. The United States cannot afford to put itself again at such enormous strategic disadvantage as we found ourselves in in Vietnam. How deep Vietnam has stamped its imprint on American history has yet to be determined. In any event, I am optimistic enough to believe that we Americans can and will learn and profit from our experience."
January 1, 1970
https://en.wikiquote.org/wiki/Bruce_Palmer_Jr.