The US squad isnt whats Abandoned, its the german squad, you can kinda see his dead hand above one of my guys' rifle barrel. The US squad killed the german squad, completely eliminated it. Sorry for any confusion. I guess its just some weird random thing.
Like one time i had a StuH climbing up a small hill, but when it got to the top of the hill, it didnt angle downwards, it kept its angle as if it were still going up the hill. It almost looked like it was gonna flip over. But i only saw that once, didnt have any effect on gameplay, just a random crazy thing.