According to nearly a dozen retired officers and current military lawyers, as well as scholars who teach at West Point and Annapolis, an intense if quiet debate is underway inside the U.S. military community about what orders it would be obliged to obey if President-elect Donald Trump decides to follow through on his previous warnings that he might deploy troops against what he deems domestic threats, including political enemies, dissenters and immigrants.
Archived at https://archive.is/He9O6
Also installed its own. All power goes both ways.
In any case, even in US history military has been used against US citizens too. Not many things can really be new.