After the event, the U.S. Army conducted an investigation and concluded there had been poor training in the Laws and Rules of Engagement, poor discipline and poor leadership up to the brigade commander.<ref>Dunnigan & Nofi, ''Dirty Little Secrets of the Vietnam War'' (1999)</ref> American 2nd Lieutenant William Calley was convicted in 1971 of premeditated murder in ordering the shootings and initially sentenced to life in prison, but two days later, President [[Richard Nixon]] ordered him released from prison. Calley served 3 1/2 years of house arrest in his quarters at Fort Benning, Georgia and was then ordered freed by a federal judge. | After the event, the U.S. Army conducted an investigation and concluded there had been poor training in the Laws and Rules of Engagement, poor discipline and poor leadership up to the brigade commander.<ref>Dunnigan & Nofi, ''Dirty Little Secrets of the Vietnam War'' (1999)</ref> American 2nd Lieutenant William Calley was convicted in 1971 of premeditated murder in ordering the shootings and initially sentenced to life in prison, but two days later, President [[Richard Nixon]] ordered him released from prison. Calley served 3 1/2 years of house arrest in his quarters at Fort Benning, Georgia and was then ordered freed by a federal judge. |