PERMIT (SSN-594) class SSN

 0 PERMIT-class NUCLEAR-PROPELLED ATTACK SUBMARINES (SSN)

 Name        Pendant   FY    Launched   Commissioned    Status
 GREENLING   SSN-614   60    1964       1967            Scrapped
 GATO        SSN-615   60    1964       1968            Scrapped
 HADDOCK     SSN-621   61    1966       1967            Scrapped

These submarines established the basic design for subsequent U.S. Navy SSNs and SSBNs, having a deep-diving capability (achieved with the use of HY-80 steel), quiet...