Treasure Island was built using imported fill from the Bay for the Golden Gate International Exposition in 1939. After the United States Navy acquired the island in 1940, it served as a US Navy military base during World War II and as an electronics and communications training school for the Navy. The Treasure Island military base closed in 1993 and the Navy ceased all operations in 1997. The city and county of San Francisco and the United States Navy now jointly own the island.


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