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

•     1919 - USS R-8 (SS 85) is commissioned
•     1941 - Keel is laid for the USS Gunnel (SS 253)
•     1942 - Keel is laid for the USS Cod (SS 224)
•     1955 - Keel is laid for the USS Skate (SSN 578)
•     1955 - USS Seawolf (SSN 575) is launched
•     1966 - USS Will Rogers (SSBN 659) is launched
•     1984 - USS Hyman G. Rickover (SSN 709) is commissioned