At the Kent State Commons, protesters assumed that the National Guard troops that had been called to contain the crowds were firing blanks. But when the shooting stopped and students lay dead, it seemed that the war in Southeast Asia had come home. John Filo, a student and part-time news photographer, distilled that feeling into a single image when he captured Mary Ann Vecchio crying out and kneeling over a fatally wounded Jeffrey Miller. Filo’s photograph was put out on the AP wire and printed on the front page of the New York Times. It went on to win the Pulitzer Prize and has since become the visual symbol of a hopeful nation’s lost youth. As Neil Young wrote in the song “Ohio,” inspired by a LIFE story featuring Filo’s ­images, “Tin soldiers and Nixon coming/ We’re finally on our own/ This summer I hear the drumming/ Four dead in Ohio.” (Photo credit: John Paul Filo).