Resident Evil 5 Mercensaries: Anything higher than SS Rank?

We didn't even know there was a double S until last week, is there higher? We scored a SS in this game:

http://www.youtube.com/watch?v=CFdKoUwYhoM

SS is the highest rank, and I think it requires 100,000 in solo mode and 200,000 in co-operative mode (I think?)