Just over four linear feet of photographs, legal documents, correspondence, handwritten notes, printed materials, and military records document the My Lai incident (16 March 1968) and the subsequent investigation and trial of the participants of the incident by the Department of Defense in 1969. The materials are dated between 1956 and 1973, with the majority of the documents from 1968 to 1972, and are divided into the following categories: legal documents, correspondence, handwritten notes, printed materials, military records, and photographs.
Included in these documents are witness statements of many of the participants at My Lai, which formed the basis of evidence the U.S. Army used to indict Lieutenant William L. Calley, Jr. and others. Also included are legal documents of the court cases between the United States Government and members of Company C, 1st Battalion, 20th Infantry and Department of the Army documents, which explain the procedures of the trial process in a military court of law during the Vietnam Conflict era.
The My Lai Collection has eighteen photographs taken by United States Army photographer Ronald Haeberle, some of which were subsequently published in Life magazine. Most of the pictures are quite graphic in their depiction of violence and should only be viewed by a mature audience. The remaining photographs were taken by Defense Department officials to document the My Lai investigation and other biographical information.