When Lehigh Valley resident Harry Fisher went to return his rental car in the Israeli city of Bet Shemesh, he heard sirens alerting of a possible missile attack. He was then quickly ushered into a safe room — common in Israeli buildings — to wait it out safely. “That can be unnerving,” Fisher said of the experience. The missile warnings, and subsequent hiding in saferooms, are common for those in the city in the days since the United States and …