With talk of peace and cooperation rather than hatred, more than a thousand people marked the 50th anniversary Friday of the My Lai massacre in Vietnam, the most notorious episode in modern U.S. military history.

On March 16, 1968, the American soldiers of Charlie Company were sent on what they were told was a mission to confront a crack outfit of their Vietcong enemies, but met no resistance and over three to four hours killed 504 unarmed civilians, mostly women, children and elderly men in My Lai and a neighboring community.

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My Lai massacre survivors lay flowers during a ceremony to remember victims of the massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

With talk of peace and cooperation rather than hatred, more than a thousand people marked the 50th anniversary Friday of the My Lai massacre in Vietnam, the most notorious episode in modern U.S. military history.

Vietnam War veteran Billy Kelly, right, lays flowers during a ceremony to remember victims of of the My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly.(AP Photo/Hau Dinh)

Provincial official Dang Ngoc Dung said at the commemoration the My Lai massacre was a typical case of "cruel crimes committed by aggressive and hostile forces" during the war. He did not name the United States but said Vietnam wants to set aside the past and befriend other countries to build a better, peaceful future.

Young dancers participate in a performance during a ceremony to remember victims of My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/ Hau Dinh)

At Friday's event, several dozen girls wearing traditional Ao Dai outfits and dove headgear, performed dances in tribute for the victims and to promote peace. Participants including government leaders, villagers and a group of American veterans laid flowers to pay tribute to the victims.

Local residents and American veterans arrive at the My Lai massacre memorial site in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

Americans who visit My Lai seem as often motivated by guilt as by wishes for a better world. It is a sort of pilgrimage for many and several have established projects, such as school and medical facilities, to contribute to the development of My Lai.

A security officer guards outside the My Lai massacre memorial in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

A security officer guards outside the My Lai massacre memorial in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

Young dancers participate in a performance during a ceremony to remember victims of My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

Young dancers participate in a performance during a ceremony to remember victims of My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, U.S. army photographer Ron Haeberle, left, speaks to Do Thi Chi, a survivor of My Lai massacre in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, U.S. army photographer Ron Haeberle, left, speaks to Do Thi Chi, a survivor of My Lai massacre in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, My Lai massacre survivor Do Thi Chi speaks to U.S. army photographer Ron Haeberle in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, My Lai massacre survivor Do Thi Chi speaks to U.S. army photographer Ron Haeberle in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, U.S. army photographer Ron Haeberle, left, speaks to a Vietnamese TV host about the photos of My Lai massacre he took in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, U.S. army photographer Ron Haeberle, left, speaks to a Vietnamese TV host about the photos of My Lai massacre he took in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

My Lai massacre survivors lay flowers during a ceremony to remember victims of the massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

My Lai massacre survivors lay flowers during a ceremony to remember victims of the massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

Provincial official Dang Ngoc Dung said at the commemoration the My Lai massacre was a typical case of "cruel crimes committed by aggressive and hostile forces" during the war. He did not name the United States but said Vietnam wants to set aside the past and befriend other countries to build a better, peaceful future.

Relations between the U.S. and Vietnam are the strongest they've been since they normalized ties in 1995. The United States is now one of Vietnam's top trading partners and investors, and relations have also expanded to security and defense.

Do Ba was 9 when American soldiers came to his house and rounded up his mother, three siblings and himself and took them to a drainage ditch. His mother and sibling were killed there. Ba was wounded, covered in blood and buried under bodies.

He played dead out of fear the soldiers would come back to kill him. He was finally rescued by a U.S Army helicopter crew that landed amid the massacre and intervened to stop the killing.

"Twenty years ago, I still harbored hatred against the American soldiers who killed my mother, brothers and sister," he said "But now after 50 years as Vietnam and the United States together developed their relations, people set aside their pain and suffering to build a better society."

Vietnam War veteran Billy Kelly, right, lays flowers during a ceremony to remember victims of of the My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly.(AP Photo/Hau Dinh)

Vietnam War veteran Billy Kelly, right, lays flowers during a ceremony to remember victims of of the My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly.(AP Photo/Hau Dinh)

At Friday's event, several dozen girls wearing traditional Ao Dai outfits and dove headgear, performed dances in tribute for the victims and to promote peace. Participants including government leaders, villagers and a group of American veterans laid flowers to pay tribute to the victims.

The My Lai Peace Foundation, a local non-governmental organization, was launched at the event.

"Vietnam had suffered numerous pains of wars," Truong Ngoc Thuy, president of the foundation, said at the launch. "We therefore more than anyone else understand the price of peace, we desire for peace."

Historian Duong Trung Quoc noted that a U.S. aircraft carrier recently made a friendly visit to a Vietnamese port for the first time since the war.

"The war has ended and both nations have learned from its lessons," Quoc said. "The greatest outcome of the lessons is for two nations to come close together in friendship and shared responsibilities, for the benefit of the people in both countries."

Young dancers participate in a performance during a ceremony to remember victims of My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/ Hau Dinh)

Young dancers participate in a performance during a ceremony to remember victims of My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/ Hau Dinh)

Americans who visit My Lai seem as often motivated by guilt as by wishes for a better world. It is a sort of pilgrimage for many and several have established projects, such as school and medical facilities, to contribute to the development of My Lai.

Mike Hastie, a 73-year old retired nurse from Portland, Oregon, who was a U.S. Army medic from September 1970 to September 1971 in Vietnam's Central Highlands, visited this week. He thinks many veterans do not come because they are too ashamed to face the Vietnamese people.

"It's just important that the My Lai massacre never be forgotten, because I think the greatest sin that we could commit would be to forget the 504 Vietnamese people who were murdered at My Lai. That's why the history has to be kept alive, not only for them but their relatives and for the country of Vietnam," he said.

Local residents and American veterans arrive at the My Lai massacre memorial site in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

Local residents and American veterans arrive at the My Lai massacre memorial site in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

A security officer guards outside the My Lai massacre memorial in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

A security officer guards outside the My Lai massacre memorial in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

Young dancers participate in a performance during a ceremony to remember victims of My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

Young dancers participate in a performance during a ceremony to remember victims of My Lai massacre in My Lai, Vietnam Friday, March 16, 2018. More than a thousand people attend the commemoration marking the 50th anniversary of the My Lai massacre in which 504 unarmed civilians, most of them women, children and the elderly. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, U.S. army photographer Ron Haeberle, left, speaks to Do Thi Chi, a survivor of My Lai massacre in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, U.S. army photographer Ron Haeberle, left, speaks to Do Thi Chi, a survivor of My Lai massacre in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, My Lai massacre survivor Do Thi Chi speaks to U.S. army photographer Ron Haeberle in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, My Lai massacre survivor Do Thi Chi speaks to U.S. army photographer Ron Haeberle in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, U.S. army photographer Ron Haeberle, left, speaks to a Vietnamese TV host about the photos of My Lai massacre he took in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)

In this Thursday, March 15, 2018 photo, U.S. army photographer Ron Haeberle, left, speaks to a Vietnamese TV host about the photos of My Lai massacre he took in My Lai, Vietnam. More than a thousand people are marking 50th anniversary of the My Lai massacre, using the event to talk of peace and cooperation instead of hatred. (AP Photo/Hau Dinh)