The Soviets used to send SSNs to SSBN deployment areas. Not really an escort as you would call it since there is no formation but the intention was clearly protecting SSBNs. Sometimes they were pre-positioned on the route the SSBN will use to detect trackers.Does SSBN's actually use SSN as escorts in reality? It seems dangerous since you have very little coordination with the other submarine unless you expose yourself by going to periscope depth. The whole idea of a SSBN is to be undetected so I don't quite get the SSN "Guard" role.