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Patrol Squadron 9 (VP-9) is a U.S. Navy patrol squadron located at Marine Corps Base Hawaii between the towns of Kailua and Kaneohe, in Honolulu County, Hawaii. As of 2011, it appears to be part of Patrol and Reconnaissance Wing Two, Commander, Naval Air Forces, Pacific.
Between 25–27 March 2006, a series of anti-submarine warfare exercises were held in Hawaiian waters that included Carrier Strike Group Nine, the nuclear-powered attack submarines Seawolf, Cheyenne, Greeneville, Tucson, and Pasadena, as well as land-based P-3 Orion aircraft from patrol squadrons VP-4, VP-47, and VP-9.