USS O-15 was a US-class submarine built by the American shipyard California Shipbuilding Company of Long Beach. The ship was commissioned on August 27, 1918, by American navy, commanded by Lt. C. K. Martin. The ship was built prior to US participation in the First World War, but only came into service during the last months of the First World War. During the First World War, the ship performed briefly patrols on the American East Coast. In 1930 the ship was scrapped in accordance with the 1930 London Convention.
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