A giant column of smoke and debris rises more than 60,000 feet into the air after the atomic bombing of the Japanese port town of Nagasaki, on Aug. 9, 1945. (ASSOCIATED PRESS)

Three days before Nagasaki, the United States had dropped another atomic bomb on the Japanese city of Hiroshima, killing up to 140,000, in the hopes that Japan would soon surrender the war.

This year, as Nagasaki and Hiroshima remember the bombings, the U.S. has for the first time sent a representative to the annual memorial service, the Associated Press reports.

U.S. Charge d'Affaires James P. Zumwalt, who is being sent, said in a statement that President Obama hoped to work with Japan toward his goal “of realizing a world without nuclear weapons.”

The memorial service comes five months after a nuclear disaster caused by an earthquake and tsunami hit Japan. Meltdowns at three reactors at a Fukushima power plant affected hundreds of thousands of residents and resulted in large evacuations.

Since the Fukushima accidents, Nagasaki survivors have only increased their calls for an end to nuclear energy.

In a protest last month, some 1,700 people rallied in the capital of Japan's Fukushima region, chanting “Abolish all the nuclear power plants!” and “Give radiation-free Fukushima back to us.”

At the memorial Tuesday, Nagasaki’s mayor, Tomihisa Taue, called on Japan to change its nuclear policy and reject all nuclear power.

“Why must this nation that has so long fought for bomb victims once again live in fear of radiation? ... The time has come to thoroughly talk about what kind of society we want and make a choice,” he said.

This year, as in all years, a moment of silence was held at 11:02 a.m., the moment the bomb dropped on the city in 1945, a bell rang out in a prayer for peace, and Nagasaki victims who were children during the bombing sang a song called “Never Again.”

Listen to American folk singer Pete Seeger sing “Never Again” in 1963:

Prime Minister Naoto Kan promised Tuesday that Japan world work to become a society not dependent on nuclear power.

“We must never forget,” Kan said of Nagasaki, “and it must never be repeated.”

See photos of the memorial and from Nagasaki in 1945 below:

A woman and a boy pray next to lanterns along a river Tuesday, paying tribute to the victims of the atomic bombing of Nagasaki. (ASSOCIATED PRESS)

Doves fly over the Peace Monument on Tuesday during a service to mark the 66th anniversary of the 1945 atomic bombing of Nagasaki in the city’s Peace Park. (AFP/GETTY IMAGES)

A man arranges paper lanterns released onto the Motoyasu River to commemorate the atomic bomb victims and pray for world peace. (KIYOSHI OTA/GETTY IMAGES)

Terraced hillsides surrounding Nagasaki did little to lessen the destructiveness of the bomb dropped on the Japanese city, seen in the wake of the Aug. 9, 1945, bombing. (ASSOCIATED PRESS)