Official Army photographer Ron Haeberle traveled with Charlie Company into My Lai on March 16, 1968. The Company was told that dozens of Viet Cong troops were passing through the area, retreating from battle after the Tet Offensive. Captain Ernest Medina had told his men that all Vietnamese remaining in My Lai after their arrival would be Viet Cong members or sympathizers.
Following the massacre, during which between 347 and 504 civilians were killed, the story remained largely out of the public eye until the media published Haeberle's photographs in November 1969. These photographs would became key evidence in the Army's five-month investigation led by General William R. Peers.
The following gallery showcases a selection of Ron Haeberle's images from the My Lai Massacre as they were used in the Peers investigation.
Many of the images are violent and graphic in nature.
With the clock ticking and the city under fire how many could be saved?
The stories of ordinary people in the tumultuous years after the Civil War, when America struggled to rebuild the Union.
In the Philippines, Army Rangers liberated 513 prisoners of war three years after the Bataan Death March.
With over a million already dead, heroic American soldiers and nurses served in the closing battles of World War I.
The Alaskan Highway stands today as one of the boldest homeland security initiatives ever undertaken.
The story of the dramatic post-World War II tribunal that brought Nazi leaders to justice and defines trial procedure for state criminals to this day.
American prisoners of war in North Vietnam tell of their experiences at the Hanoi Hilton and other notorious prisons.
The staggering death tolls of the Civil War permanently altered the character of the republic and the psyche of the American people.