The My Lai Massacre Investigators refer to the U.S. Army's investigative units, including the Criminal Investigation Division (CID) and the subsequent Peers Commission (also known as the Peers Inquiry), established to examine the war crimes committed during the My Lai Massacre on 1968-03-16 in Son My village, Quang Ngai Province, South Vietnam. The initial CID investigation began in late 1969 following public disclosure of the incident, leading to charges against 26 soldiers, with Lt. William Calley convicted of murder in 1971. The Peers Commission, appointed by Army Chief of Staff General William Westmoreland, focused on the cover-up and systemic failures, producing a 1970 report that criticized high-level concealment efforts. Colin Powell, then a major, participated in related investigations and has been accused of contributing to the whitewash through his review of incident reports.