This is just too good not to share......

[Dion]

Could be the camera is mounted on another tank in the formation or some other vehicle, and it may be using one of those automatic focusing cameras, causing it to out of focus for a split second. Also it may be why the backround is moving (though I never looked at the background very closly, so I didn't notice if it's moving or not, just replying to observations of another poster).