Repeated impacts from ocean waves damaged Coast Guard rescue boat crews' brains for decades unnoticed. A teenager's research project after her father's suicide exposed widespread traumatic brain injuries among elite surfmen—injuries the military had completely overlooked despite spending billions studying brain trauma. Coast Guard surfmen exposed to rough seas experience repeated traumatic brain injuries similar to combat troops, despite no direct head contact, because wave forces act like whip cracks through the body with impact equivalent to car crashes.