[Civil Engineering]
BWii is for up to 2 online players. There are 4 missions designed for Co-op, 6 missions for VS. Assault (capture/defend base), and i don't remember how many in VS. Skirmish (defeat enemies for points).
Both players never have the same units/roles. Wish there were more than 4 co-op missions, but once you're in, there's plenty to do, and always gotta be on the move to get a good rating.