Around here the Sheriff is the last line of defense.
After that it is up to us.
We are ready.
I have posted often that the reason all law enforcement should be turned over to the sheriff is that the sheriff is voted in by the citizens and is closely attuned to their needs. No other police force I know of is directly accountable to the public.
The exception to that would be very narrowly tasked special police such as the US Marshals, Secret Service, game wardens....