That's not the only level. Remember one thing about the lowly enlisted man. They are taught to OBEY ORDERS above anything else. That's what boot camp is all about. Not all will wage war on American citizens, but you can bet that some will.
I give them more credit than that - most know that going weapons free on fellow citizens won’t end well for them. I’d bet a good third of their ‘leaders’ ordering such an action would get a round in head by one of their troopers.