Dude, I wasn't born yesterday. That was not the point you made, however much you may be trying to backtrack now. Why not just admit you were wrong?
You made a bald, unqualified statement about attitudes towards race in the military as a whole, based on your flawed assumption that such integration was actually widespread:
That's a broad statement about the actual attitudes of WW2 vets as a whole, not just to that relatively small percentage with a black platoon. And you made that broad point about attitudes within the military to counter the claim of racism among WW2 vets. The revisionism into the far more narrow claim you are trying to make now "well, I was really only talking about that small percentage of WW2 vets that worked in integrated companies" undercuts your entire point about only a small percentage being racist.
However, I do absolutely agree with your point about how working closely with people of another race in the military breaks down racist attitudes.
But consider logically where that takes you - we've now had more than sixty years since Truman desegregated the military. That's sixty years of people of different races working side by side on the military, and not just in specifically integrated companies (all non-combat units in WW2, by the way), but in the entire military.
So that is sixty years of tens of millions of vets serving this country, reducing their racial prejudices, and then bringing those new and improved racial attitudes back into society as a whole.
By your own argument, it is almost possible not to conclude that racial attitudes by whites both in the military and in the civilian world (which also became much more integrated) have improved significantly since the WW2 generation.