Don't worry. All the heroic men and women in the armed services will decide THIS oppression of a civilian populace is too much and some of the officers will resign. Then, in just a decade or so, they'll have O-5s who are only qualified to be O-3s and it will all come crashing down! And if you disagree, you are just a doomer!
Yeah... This does not end well in any conceivable way.
The world is also filled with governments that ordered the military to shoot civilians and are still comfortably in power. No country is immune to authoritarianism, the US is not exceptional.