The shootings at the Army's Fort Hood in Texas Thursday were an "isolated incident," according to military officials.
But there have been other attacks by military personnel in recent years – some in the United States, some in the war zone in Iraq – and they happened over a period of sustained combat and multiple deployments when increasing numbers of soldiers are experiencing Post-Traumatic Stress Disorder (PTSD) and committing suicide.
Fort Hood shootings: How often do soldiers kill soldiers?
