The one movie listed already, The Best Years of our Lives, was the first film I can recall that really delved into the impact of war on our troops and sailors. It actually dealt with the physical and mental traumas that all the other films either glossed over or ignored. For that alone it deserves to be seen by every generation and especially our politicians.
The list of films has already included all of my favorites with a couple of exceptions. One is The Pacific and the other is the one about Desmond Doss. The title escapes me right now, senior moment, sigh.