I don't know if you misstated that or not, but that's incorrect. African American men were indeed allowed into combat during World War II.
You're right; in my haste, I did misspeak. What I meant was that they weren't integrated with white soldiers like Gabe Jones was in the Sgt. Fury
comic and Captain America: The First Avenger
, or as Nick Fury's father Jack was in the Avengers: EMH