To be honest, they're getting a bit old, they need to be replaced, and underneath the brave face the shipyards and staffing levels are challenged: https://www.

To be honest, they're getting a bit old, they need to be replaced, and underneath the brave face the shipyards and staffing levels are challenged: https://www.buildsubmarines.com/mission https://www.buildsubmarines.com/mission Probably all good in the long run, unless POTUS has a 3 am on the gilt toilet moment and declares they all need to be steam powered and have their conning towers moved. ( see: Ford class carriers )