Sir! NO Sir! tells the story of how--from the very start of the war, such as with the Green Berets--there was resentment within the ranks over the difference between the war in Vietnam and (as persons state in the film) the "good wars" that their fathers had fought. In the beginning some simply left the military as individuals, though over time, it became apparent that so many were opposed to the war that they could speak of a movement -- which over time eventually made the military almost inoperable...