DF5 will never be numbered

  There are too many complications with dealing with silo based ICBMs. Even if they are discovered, the attack must be strong enough destroy their hardened bases. And the attack must come on all of the silos simultaneously. DF5s can be fired preemptively or through counter. If the Chinese feel that any segment of its Silo based ICBMs are being threatened, they can fire the rest of them right away. If the Chinese fire them preemptively simply because some patrol ship was struck in the middle of the sea, then its just waiting for them to land.