Long misunderstood, too often ignored, and repeatedly misdiagnosed, it has gone by a multitude of names. World War II veterans struggled with the symptoms of “battle fatigue,” while their fathers and uncles spoke in whispers of “shell shock,” the mysterious malady that for many defined the months—even years—following the First World War. And five decades before, men in Confederate grey and Union blue returned from the bloodiest war in American history, forever burdened with memories of death and devastation, an enigmatic syndrome that became known as “soldier’s heart.” It was not until the Vietnam War that post-traumatic stress disorder (PTSD) began gaining recognition as the real and debilitating affliction it is.