From a rationale perspective, this makes complete logical sense, because there's little to no career advancement if the military simply protects core American interests such as the border. In contrast, the military makes for one of the most promising career alternatives if the US maintains a global posture, intervening/occupying every strategic niche around the world.
If the military does side with Congress, then the USA will have completed its arc from republic to fascism. At that point, the parallels with Nazi Germany become quite evident, as it was the military, junkers (GOPe + DNC) and banks that backed Hitler. From that point, American citizens would become slaves to the system, and their youth requisitioned to advance the interests of connected insiders.
One other observation: Orwell got it wrong. You don't need an oppressive force to force people to constantly toe the line. Rather, if the MIC sides with Congress in impeaching Trump, then it will merely be a continuation of the status quo established with Bush I and running through Hussein. In this type of environment, people can bitch and complain all day long without any real fear of retribution; it doesn't affect the outcome one iota.
Which is why I wonder if there really would be any civil unrest in such an event. Was Hussein so bad as to be willing to throw everything away? People still could travel freely, make money, have a job, raise a family, fly the Gadsden, promote the 2A, etc. It was essentially a soft totalitarianism, but possibly easy to live with given the alternative. And, an important rationalization process would be that why should someone fight the system today after their parents allowed the actual defeat of liberty to occur nearly 30 years ago?
Food for thought.