You are delutional if you think that. The US military will do exactly as ordered and won’t give a rats ass murdering an entire family to get their firearms.
Police, the same thing. They care more about their paychecks and pensions to care who they murder if ordered to do so.
Better to die on you feet where they have to pry the weapon from your cold dead hands after taking out a few, then on your knees begging to know where this train is taking you to?
Honestly I think your delusional to think the entire military of 1.3 million people stand a chance against 75 million pissed off gun owners. Sending in helicopters and Spectre aircraft to gun us all down is not great for optics. Thats why ANTIFA and BLM was never attacked by the guard.
So taking an oath to defend the constitution would mean nothing to the military and police. Obviously when the politicians take the oath, it means nothing.