JOHNSTOWN — Just seven months after announcing that a big contract would bring up to 100 new jobs to Johnstown, KDH Defense Systems administrators are leaving town. Employees, who number an estimated 100 or more, were informed this week that the Broad Street manufacturer of military vests is “permanently closing” no later than July 1. The letter from John Hornick, KDH human resource manager, also says most of the company’s local workers had been laid off “on a temporary basis” in January and February. “Unfortunately, the business environment has not improved and therefore we are unable to call back any...