September 21st - On This Date - US Navy Submarine Service

    1916 - Keel is laid for the USS O-15 (SS 76)

    1922 - USS S-10 (SS 115) is commissioned

    1921 - USS R-6 (SS-83) Ran aground off Chatham, MA. Salvaged and repaired

    1942 - Keel is laid for the USS Corvina (SS 226)

    1945 - USS Pollack (SS 180) is decommissioned

    1987 - Keel is laid for the USS Jefferson City (SSN 759)

    1993 - USS George Bancroft (SSBN 643) is decommissioned