Rockefeller to respond to the Rochester 1964 race riot in July of that year. The California Army National Guard were mobilized by the Governor of California Edmund Gerald Brown, Sr. during the Watts Riots, in August 1965, to provide security and help restore order. Elements of the Ohio Army National Guard were ordered to Kent State University by Ohio's governor Jim Rhodes to quell anti-Vietnam War protests, culminating in their shooting into a crowd of students on May 4, 1970, killing four and injuring nine. The massacre was followed by the Student strike of 1970. During the Vietnam War, service in the National Guard was highly sought after, as an enlistment in the Guard generally prevented a person from being sent to combat; only a handful of Guard units were ever deployed to Vietnam. In 1968, the National Guard had only 1.26% Black soldiers. During the Vietnam War, Secretary of Defense Robert McNamara created the Selective Reserve Force (SRF) in October 1965. Since funding was not available to train and equip the entire National Guard adequately, the SRF would be a core group of 150,000 National Guardsmen available and ready for immediate overseas deployment if needed. SRF units were supposed to be authorized at 100% strength, receive priority training funds and modern equipment, and have more training and do 58 hours of drills of four hours each a year rather than the standard 48 hours of drills. The 2nd Battalion 138th Field Artillery of the Kentucky Army National Guard was ordered to service in Vietnam in late 1968. The unit served in support of the regular 101st Airborne Division. The Battalion's C Battery lost nine men killed and thirty-two wounded when North Vietnamese troops overran Fire Base Tomahawk on June 19, 1969. During the early 1980s, the governors of California and Maine refused to allow deployment of their states' National Guard units to Central America. In 1986, Congress passed the Montgomery Amendment, which prohibited state governors from withholding their consent. In 1990, the Supreme Court ruled against the governor of Minnesota, who had sued over the deployment of the state's National Guard units to Central America. During the 1992 Los Angeles Riots, when portions of south central Los Angeles erupted in chaos, overwhelming the Los Angeles Police Department's ability to contain the violence, the California Army National Guard and selected units of the California Air National Guard was mobilized to