The military has given up the search for missing sailors and started efforts to salvage the Navy corvette Cheonan, which sank due to an unexplained explosion on March 26. The decision follows a request from the families of missing sailors after several people died or were injured in search operations in treacherous waters. Navy Warrant Officer Han Joo-ho died on March 30 and the Kumyang 98, a dragnet trawler, sank during search operations in waters off Baeknyeong Island last Friday evening and crew died or went missing. Experts speculate that the salvage operations will take at least 10 days even...