The Kent State shootings were the killing of four and wounding of nine unarmed college students by the Ohio National Guard on the Kent State University campus. The shootings took place on May 4, 1970, during a rally opposing the expanding involvement of the Vietnam War into Cambodia by United States military forces as well as protesting the National Guard presence on campus and the draft. Twenty-eight National Guard soldiers fired about 67 rounds over 13 seconds, killing four students and wounding nine others, one of whom suffered permanent paralysis. Students Allison Krause, 19, Jeffrey Glenn Miller, 20, and Sandra Lee Scheuer, 20, died on the scene, while William Knox Schroeder, 19, was pronounced dead at Robinson Memorial Hospital in nearby Ravenna shortly afterward.

The Ohio Army National Guard is a part of the Ohio National Guard and the Army National Guard of the United States Army. It is also a component of the organized militia of the state of Ohio, which also includes the Ohio Naval Militia, the Ohio Military Reserve and the Ohio Air National Guard. The Ohio Army National Guard consists of a variety of combat, combat support, and combat service support units. As of September 2010, its end strength exceeded 11,400 soldiers. Its headquarters is the Beightler Armory in Columbus, Ohio. Many units conduct Annual Training at Camp Grayling, Michigan.