The Washington Post essay doesn’t bother to make the case that integration helped to make the American military a more formidable fighting force. That is irrelevant to them.
I am sure that integration came at a price to blacks and to non-blacks.
There are more Native Americans in the Special Forces than blacks, yet the National Geographic TV show Six (about Seal Team Six) features as a main character a black man (played by Edwin Hodge) who graduated from Harvard.