Shortly before noon on May 4, 1970, several hundred students at Kent State University protesting the escalation of the Vietnam War into Cambodia were ordered to disperse by the Ohio National Guard. When the order was ignored, the guardsmen fired tear gas and then advanced across a field to a hill where the students had gathered.

At 12:34 p.m., two dozen guardsmen clustered atop the hill fired their M-1 rifles in the direction of a crowd of students. Sixty-seven shots rang out during 14 terrifying seconds. When the shooting stopped, four students lay dead, and nine others were seriously wounded. A photo captured the moment a teenage girl realized student Jeffrey Miller was dead from a soldier’s bullet.