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Three hurt in US helicopter hard landing in Thailand

US Secretary of Defense Leon Panetta (right) watches a CH-46 Sea Knight taking off from the USS Peleliu off the coast of San Diego, California on March 30, 2012. A US Marine helicopter on Wednesday made a "hard landing" during military exercises in northeA US Marine helicopter on Wednesday made a "hard landing" during military exercises in northern Thailand, seriously injuring some of the passengers, the US Embassy in Bangkok said.