Based on the plates visible in the pictures the majority of the cars, including the metallic puke green E36 with gold wheels, belong to Germans (one from Switzerland?).
The red M3(?), the black with silver checkered E46, the topaz E46 (looks stock), the red E36, and the blue E39 are U.S. forces registered cars.
Wait, I don’t have a point…………….. I think I’m going to be sick.