I'm not worried about the military.  The military will sort that kind of behavior out real quick.  This or that soldier may be conservative or liberal, and groups just the same.  And stupid shit like that will happen, of course -- but, again, the command structure will not be pleased, and they'll spend a few days scrubbing toilets with toothbrushes (or whatever the modern equivalent is) and learn a lesson.

The FBI, CBP, ICE, etc -- the Cops Who Wear Suits agencies -- are far more worrisome than the military.  For one, because they operate domestically, of course, unlike there military (outside of natural disaster response and the like).  For another, because they're not under the same kind of structure and programmed the same way as the military.  Same with cops and sheriffs at the local level.  

Be nice to America. Or we'll bring democracy to your country.