US Naval Institute reports that the Navy is doing something new in the Atlantic. They are establishing an on call Surface Action Group (SAG) “Navy Creates New Atlantic Destroyer Task Group to Hunt Russian Submarines.”
To me this highlights a couple of things. First apparently there is no comparable group in the Pacific. Second there is only one group to cover the entire East Coast and Gulf of Mexico. So if the Coast Guard calls on the Navy for assistance, its likely there will be a long wait.