SSN-687
During her time at Mare Island, it was decided that she would become a special projects submarine.
>Special projects submarine
After a short period of post-overhaul testing and sea trials, she underwent extensive ocean engineering modifications prior to commencing operations as a unit of Submarine Development Group 1.
>Extensive modifications
As a member of Sub Dev Group 1, she spearheaded a testing program for submarine rescue technology.
>Submarine rescue technology - ie, underwater spying/salvage operations
They wouldn't 'decommission' a submarine to enter it into the clown fleet… would they?