It depends on who is the aggressor. If it is Americans vs. American soldiers, I think you see the armed forces ranked quickly depleting and the civilian ranks growing in experience, weaponry and tactics. I don't think many American soldiers would be too willing to fire upon their own. Maybe in the start, but not for long.
If it were say China, then we would still have better armament, as the US armed forces would be there fighting along side the civies. Besides, you take a few armored tank groups with some claymores in the tress and you can grab all the RPGs and Ak47s you need. Oh, wait, that was Red Dawn. Wolverines! Hell, they did it with a hand full of bolt actions, a couple bows and grandaddy's pistol.
If it were say China, then we would still have better armament, as the US armed forces would be there fighting along side the civies. Besides, you take a few armored tank groups with some claymores in the tress and you can grab all the RPGs and Ak47s you need. Oh, wait, that was Red Dawn. Wolverines! Hell, they did it with a hand full of bolt actions, a couple bows and grandaddy's pistol.