Well, the only disruption so far is Trump's tweet and heaven only knows what to make of his tweets.  At this stage there appears to be a lot more tweeting than actual doing, so one can only hope that every citizen who volunteers to serve will be given an opportunity and a fair shake once they've joined the service.

From my point of view, Obama was on the right side of the broad arc of history.  Racial discrimination in the military officially ended when I was a child, women have since expanded their roles, and most recently gay soldiers have found a place.  The long-term trend is toward inclusion of classes of people once thought to be unfit.