About 12 years ago before anybody ever thought Trump might be President, my grandfather and I did a deep dive on the history of our constitution and comparisons to other countries that tried to copy it. What did they change, and did those changes work, etc.
We stumbled across something we thought was interesting. Many other countries' armed forces have an enlistment oath similar to ours. But there is one key difference: most of these other enlistment oaths have the enlistee pledge loyalty to the nation or the people in a generic sense. Ours does not. Ours has them pledge to the constitution. So it will be a bit harder to pull off a coup here. But oh Lord he will try, rest assured of that. He will do what he can to get people around him who either believe everything he says, or don't mind breaking their oaths. And he will try (again) to create a situation where "oh they're not following the constitution/law anyways, just follow me and let me throw them in jail and maybe we will eventually follow the constitution again later".

---