Thanks.
Let me hasten to add that the Navy has done weird things with their numbering over the years. When they commissioned the Seawolf subs they began their hull numbers at 21 - indicating that it was the sub for the 21st century or some such crap. So those three are SSN21 through 23. They went back to the correct sequence with the Virginia’s - the last of the Los Angeles class is SSN-773 and the first of the Virginia’s is SSN-774.