September 20th - On This Date - US Navy Submarine Service

• 1922 - USS S-28 (SS 133) is launched
• 1941 - USS Greenling (SS 213) is launched
• 1945 - USS O-4 (SS 65) is decommissioned for the second time
• 1945 - USS R-1 (SS 78) is decommissioned for the second time
• 1946 - USS Spinax (SS 489) is commissioned
• 1946 - USS Hardhead (SS 365) is decommissioned
• 1968 - Keel is laid for the USS Billfish (SSN 676)
• 1977 - USS Archerfish (SSN-678) Collides stern to stern with USS Philadelphia (SSN-690) at Groton, CT
• 1991 - Keel is laid for the USS Tucson (SSN 770)
• 1991 - USS Sam Houston (SSBN 609) is decommissioned

Credit to Ron Howard