In my opinion the chances of a military takeover in this country, based on Politics or any other reason, is lower then any other country on earth. It just couldn't happen in America. I know that may disappoint some of you conspiracy junkies but Ive been on both sides of the fence and its as close to impossible as you can get. First off 99% of the soldiers would tell their General to bugger off and then they would side with the citizenry. But it would never even come to that.
The only possibility of any of this happening is if in event of a terrible domestic emergency and then, and only then, would the military be empowered lawfully. I'm talking like in case of a nuclear attack or something like that. It could never be done unlawfully.
I was both in the military and stationed in a country where the military overthrew the civilian Govt. and took power. Its actually laughable to think such an even can happen here in America. Our soldiers, sailors, airmen, coast guard, and marines, simply wouldn't obey such orders and the conspirators would be arrested on the spot.