Horse ****. It was in the GOP debate last night and is a valid observation. Not off topic in any way.
Perhaps you're correct that it isn't off topic, but it is a tangent that isn't central to the focus of the thread. We don't need to run down the detailed history of social change in the military, because none of the candidates did. Simply say Huckabee was wrong and leave it at that. Two final points on the matter. One, what would the overwhelming majority of those desegregated black soldiers say about TG in the military? Two, If I'd been Huckabee (and I'm not so don't conflate this as my position), I'd have just said "Every army needs cannon fodder" and left it at that!