And while My Lai was the most notorious massacre in modern U.S. military history, it was not an aberration: Estimates of civilians killed during the U.S. ground war in Vietnam from 1965 to 1973 ...

Cong, 61, was the director of the My Lai Massacre Museum, until he retired last year. Like him, many survivors are reliving their memories.

Army Lt. William L. Calley Jr. led the U.S. soldiers who killed hundreds of Vietnamese civilians in the My Lai massacre, the most notorious war crime in modern American military history. He was 80.

My Lai Massacre survivor Do Ba, 48, left, of Ho Chi Minh City, meets with former U.S. Army officer Lawrence Colburn, 58, right, of Canton, Ga., on the 40th anniversary of the massacre.

The My Lai massacre in 1968 was “the absolute low point in the history of the modern US military,” a Pulitzer Prize winner wrote. William Calley was a commanding officer at the scene.

This past week marked the 46th anniversary of the My Lai massacre, in which 504 unarmed Vietnamese civilians were massacred by U.S. troops in 1968.

Everybody’s heard of the My Lai massacre — March 16, 1968, 50 years ago today — but not many know about the man who stopped it: Hugh Thompson, an Army helicopter pilot. When he ar… ...

And while My Lai was the most notorious massacre in modern U.S. military history, it was not an aberration: Estimates of civilians killed during the U.S. ground war in Vietnam from 1965 to 1973 ...

And while My Lai was the most notorious massacre in modern U.S. military history, it was not an aberration: Estimates of civilians killed during the U.S. ground war in Vietnam from 1965 to 1973 ...

And while My Lai was the most notorious massacre in modern U.S. military history, it was not an aberration: Estimates of civilians killed during the U.S. ground war in Vietnam from 1965 to 1973 ...

And while My Lai was the most notorious massacre in modern U.S. military history, it was not an aberration: Estimates of civilians killed during the U.S. ground war in Vietnam from 1965 to 1973 ...

Truong Thi Tri, 76, visits the memorial museum for victims of the My Lai massacre in Son My village in Quang Ngai province on March 15, 2018. AFP via Getty Images.