The USS Simpson has been decommissioned, marking the end of an era in America's naval fleet. The 30-year-old vessel was the last modern warship to sink an enemy target during battle. Built in 1984, the Simpson down Iran's Joshan gunboat in the Persian Gulf in 1988 - America's only maritime battle since the Second World War. But now, as the Department of Defense grapples for funds to complete the new zumwalt-class fleet, the Simpson's days have come to an end. It will be towed to a port in Philadelphia and possibly sold to a US ally. The ship was built...