The head of the troubled Phoenix veterans’ hospital was fired Monday as the Veterans Affairs Department continued its crackdown on wrongdoing in the wake of a nationwide scandal over long wait times for veterans seeking medical care and falsified records covering up the delays. Sharon Helman, director of the Phoenix VA Health Care System, was ousted nearly seven months after she and two high-ranking officials were placed on administrative leave amid an investigation into allegations that 40 veterans died while awaiting treatment at the hospital. Helman had led the giant Phoenix facility, which treats more than 80,000 veterans a year,...