BANGKOK (Reuters) - An army helicopter carrying nine people crashed in a hilly jungle along Thailand's border with Myanmar on Tuesday while on a mission to retrieve the bodies of five soldiers killed in another helicopter accident at the weekend. The U.S.-made Black Hawk helicopter went down in poor visibility, raising to 14 the expected casualties from two air accidents in three days in western Phetchaburi province, army officials said. The two helicopters had flown over a rugged, rain-soaked region that was hard for rescue teams to reach on foot.