I know, I haven't got my SAS and Spetznas ribbon either. In a other part of this forum, I read that the ribbon thing is a bug in SF, because EA wasn't really finished with the game. Hopefully there will be another patch shorty to solve this problem.
The other SF ribbons will work (i have the Armoured Service Ribbon), but I think the Aerial Service Ribbon will be hard to get, because you can't fly planes in SF (?????).
There are new infos i got from B.Schuss. It looks like a bug and nobody knows what EA will do. But EA knows the problem. All we can do is wait. See ya soldiers and thanks for your infos