I watched Buffalo Soldiers: A Quest for Freedom last night. It was not just about the black men who served in the founding of the West, but covered all the way through Korea, when all the armed services branches were finally desegregated.
The army asked for black troops to volunteer to fight amongst the other men during the Battle of the Bulge. 5000 volunteered, 1000 were chosen. But since they would be reinforcements into white divisions, and not black ones, each soldier had to accept being busted down to private, since the Army couldn't have any black men with higher ranks than whites. And even with this stipulation those men voluntarily gave up their rank. Those ranks were never restored, even after the war. Pitiful.
This kind of thing is what they are hoping to erase from history, but never will be able to. Only those who want to willfully ignore certain parts of history for their own comfort will accept any of these whitewashed versions being brandished today.