Yep! Just look at how much better the black service people did compared to thier other counterparts. Kinda makes you proud and less guilty for all the shame of our forefathers.
( That is, while we're being danged proud of everything that moves.)
Ain't Life grand?
I don't think there's any way to determine from the numbers which group served better. My experience as an Army Chaplain says that all our soldiers (less a miniscule fraction of malcontents) perform at the highest levels of excellence.