Post-traumatic stress has followed American soldiers home since before it had a name, and this HBO documentary traces it from the Civil War, when doctors called it "nostalgia" or "soldier's heart," through World War II's "battle fatigue" to the diagnosis now known as PTSD. Executive producer James Gandolfini appears on camera alongside historians, military psychiatrists, and families left behind, including relatives of Noah Pierce, an Army specialist who took his own life after two tours in Iraq. Archival letters and photographs carry the historical sections, while present-day interviews with veterans of Iraq and Afghanistan and the parents and spouses who lost them to suicide anchor the contemporary story. The film treats military suicide not as a new crisis but as the latest chapter of a problem the armed forces have documented, mislabeled, and often ignored for a century and a half. It closes on the current numbers, framed against everything the earlier wars should have already taught.