The Army town of Killeen struggles to understand the tragedy
                                
                                
                                    (Newser) -
                                    An Army community painfully accustomed to death on foreign shores, Killeen's 86,000 residents are struggling to understand this very different kind of tragedy. "I kind of thought after 9/11, it was only a matter of time before there was a terrorist attack here," Sharon Gregory, who lives...