I never had any problem serving under somebody of any race - because I knew that if they had got there, it was because they had earned it.
Just the fact that the idea of putting somebody in command because of their race has been voiced, can lead to people starting to doubt that - the mere expression of the idea works against the interests of the people it’s supposedly meant to help.
Because everybody can wonder “Is he there because he’s good enough - or just because he ticked the right boxes on the chart?”
You should never have any reason to doubt that the person giving you orders deserved to be there. Such doubts are poison.
In 1969 at Fort Ord, my drill sgt, 1st sgt and mess sgt as well as others were black.