There’s about a dozen layers of nuance that need to be addressed before we advocate for all million or so military members to rise up against presidents (or congressional representatives, or judiciaries, or…)
The first of which is the definition of “enemy.”
It’s a huge fucking stretch to expect individual soldiers to be able to declare who is or is not an enemy when you’re not under imminent danger or protecting any critical assets. Supervising officers largely do not make that decision. Unit commanders largely do not make that decision. Even combatant commanders largely do not make that decision. The same way we do not expect US Naval ships facing harassment from Iranian rocket boats on a daily basis to decide that “today’s the day” and start a war with Iran is how important this distinction is.
The military needs an actual order, coming from some combination of the Joint Chiefs and the National Security Advising team in order to define enemies and engage in combat. Congress (should) officially declare enemies of the United States. There is some current debate on if the US needs to officially declare “enemies” in order to add gravity to some charges like treason, but my understanding is that China is no more an enemy of the US than Russia is.
Thus, expecting the military to rise up against a president is expecting them to jump every level in the chain of command and take on the impossible decision of deciding what’s in the United States’ best interest themselves. I think that’s generally considered a shitty take.