With the benefit of 45 to 50 years of hindsight, I'm not willing to judge any young man who stepped forward when called, under pain of imprisonment, to that fight. It seems awfully smug to hold Vietnam era draftees to a standard that no one here would live up to.
We are all called to do all sorts of things that, in our heart of hearts, we're not sure are correct. There has to be some leeway for the bounded rationality with which we all are burdened. Put simply, to criticize those young men for not responding then in the way we now think they should have responded is the height of intellectual dishonesty.