On March 16, 1968, a group of U.S. soldiers attacked the South Vietnamese village of My Lai, believed to be a Communist stronghold, and killed between 175 and 400 civilians as well as committing rape and other crimes. U.S. helicopter pilot Hugh Thompson and two crewmen, who were flying a reconnaissance mission over My Lai, saw the dead bodies and stopped to investigate. In the process, they managed to rescue a group of Vietnamese civilians from American troops. Although Thompson reported the incident to his superiors, the American public didn't learn about it until over a year later, after a former soldier named Ronald L. Ridenhour wrote letters about what happened at My Lai to President Richard Nixon and other government officials. Ridenhour had found out about the events a month after they occurred from soldiers who were there. 

The Army eventually launched an investigation that led to the conviction of platoon leader Lt. William L. Calley, Jr., for the murder of 22 unarmed men, women and children. In 1971, Calley was sentenced to life in prison, which was later reduced to 10 years. Ultimately, he served three years under house arrest.

The My Lai massacre left many Americans further disillusioned about the Vietnam War. People were horrified that U.S. soldiers had committed atrocities against innocent civilians and were angered at the potential military cover-up, as well as the fact that Lt. Calley was the only person convicted for the murders.

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