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.
A revealing portrait of one of America's most paradoxical leaders.
In the Philippines, Army Rangers liberated 513 prisoners of war three years after the Bataan Death March.
After notorious revolutionary leader Pancho Villa's raid on Columbus, New Mexico, General John Pershing and his 150,000 man cavalry set out to get Villa.
The international race to develop biological weapons during the 20th century.
President Woodrow Wilson lead America during World War I, created the Federal Reserve, and helped create the League of Nations. Part of the award-winning Presidents collection.
The Alaskan Highway stands today as one of the boldest homeland security initiatives ever undertaken.
American prisoners of war in North Vietnam tell of their experiences at the Hanoi Hilton and other notorious prisons.
The story of a Vietnamese mother, the Amerasian daughter she sent away for adoption, and their reunion 22 years after the Vietnam War.