A Virginia man who once spent eight years on the run from naval investigators was arrested in Somerset County early today with a trove of high-powered weapons, including a grenade-launcher and two assault rifles, along with maps of a U.S. military base and a civilian neighborhood, authorities said. The federal government’s Joint Terrorism Task Force quickly joined the investigation into Lloyd R. Woodson, 43, who had been staying at a Branchburg motel since last week. Woodson, whose last known address was in Reston, Va., was wearing a bullet-proof vest and carrying one of the assault rifles — customized to shoot...