Not sure of the exact numbers, Horatius, but Fort Bliss in El Paso, TX, has a large complement of German soldiers stationed there; or they did when I was stationed there (now that they're moving the ADA units to various other posts, I'm not sure where they'll go, but they're there for training in ADA as I recall, and since I don't think they're moving the school, they'll probably stay there).
Granted, it's not Soviet soldiers... but I'd guesstimate the numbers of Germans on Fort Bliss to be close to three thousand, perhaps. That's about two brigades, probably. Might be a bit under the limit though, depending on the time frame you're looking at.
I'm horrible at guesstimating though, so for all I know it's only three hundred. *LOL* I never saw them all in one place.