Post-traumatic stress disorder runs through American military history from the Civil War to Iraq and Afghanistan, and this HBO film follows soldiers and veterans across that span who never fully came home even after the fighting ended. Interviews carry the weight of the film: men who fought in the 1860s were diagnosed with "soldier's heart" or "nostalgia," World War II and Vietnam veterans describe decades of nightmares and isolation, and more recent Iraq and Afghanistan veterans speak about flashbacks, anger, and strained marriages. Families appear alongside the soldiers, describing what it means to live with someone who flinches at loud noises or disappears emotionally for years at a stretch. The film also addresses the rising suicide rate among active-duty troops and veterans, treating it as the sharpest current consequence of untreated combat trauma. By tracing the same set of symptoms under different names across a century and a half of American wars, the film argues that PTSD is not a modern anomaly but a constant cost of combat that the military has been slow to name and treat.