Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The United States Navy's O class submarines were created out of the lessons learned from the United States L class submarine. The O class were more robust with greater power and endurance for ocean patrols. The O class were built much faster than previous classes and were commissioned in 1918. The group 2 boats entered service just before the end of World War I. Eight of the group 1 boats survived to serve in World War II as training boats when they were recommissioned in 1941.

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