This. I understand wanting more Transformers on screen, but you can't discount the military. They've been working with the Autobots and were trained by the Autobots to be able to fight Decepticons. And really, they didn't exploit any weakness that isn't logical. It's David vs. Goliath times 200, using tactics like taking out the eyes or bombs under the armor are going to work, especially since these are trained military soldiers (or are Sam, who has main character immunity and can do anything even take out Starscream).