The repatriation of the remains of American service members from the Korean War, which ended 65 years ago, was one of the four points listed in the joint statement President Donald Trump and North Korea's leader Kim Jong Un signed on June 12 during their historic meeting in Singapore.
Trump also took to Twitter earlier to praise an "incredibly lovely ceremony" in Hawaii, where Vice President Mike Pence helped welcome the remains to the United States. About 5,300 were lost in what is now North Korea.
Vice President Mike Pence said: "Some have called the Korean War the 'forgotten war'".
Fox News' Pete Hegseth, who was traveling with Pence in Air Force 2, recalled the touching story of the heroes' now-grown children.
The caskets, which are thought to contain the remains of US soldiers who died during the Korean War in the 1950s, are now traveling from South Korea to Hawaii, where forensic experts will conduct a thorough analysis to identify the remains.
"There is no reason to doubt that they do relate to Korean War losses", John Byrd, director of analysis for the U.S. Defense POW/MIA Accounting Agency (DPAA), told reporters at Osan air base in South Korea, just before the remains were due to be flown to Hawaii for further analysis and identification.
Pence looked on solemnly with his hand over his heart as the long, narrow boxes were gently laid on the stanchions in front of him. There are 9,569 United Nations Command personnel who remain unaccounted for from the Korean War, including 7,699 Americans.
The report came after President Donald Trump tweeted following a summit last month in Singapore with North Korean leader Kim Jong Un that "there is no longer a Nuclear Threat from North Korea".
The Kaakimaka family provided DNA samples to the US military's Defense POW/MIA Accounting Agency over a decade ago, hoping officials would be able to make a match.
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Only one identification "dog tag" was delivered by the North Koreans, underscoring the long path ahead for USA military efforts to identify the remains inside the 55 boxes presented by North Korea to the United States last week.
It was not the first time US intelligence clashed with the president's optimism.
The Washington Post reported on Monday that North Korea appeared to be building one or two new liquid-fueled intercontinental ballistic missiles at the large research facility on the outskirts of Pyongyang, citing unidentified officials familiar with intelligence reporting.
"This is a huge step in the right direction that we hope will finally bring peace to the peninsula and closure to American families who have been waiting more than six decades for their loved ones to return home from their war", Veterans of Foreign Wars National Commander Vincent "B.J". They may also talk about ways to make sure their fishermen peacefully operate along the Korean sea boundary, the site of several bloody naval skirmishes in recent years.
According to a report by Associated Press, there are 7,699 U.S. service members listed as unaccounted for from the 1950-53 Korean War, of which about 5,300 are believed to have died on the North Korean soil.
Numerous fallen service members died in North Korea and were buried by their comrades where they fell.
Experts said it was still unclear whether the rivals can reach any breakthrough agreement on reducing tensions in the near future because South Korea, in close consultations with the United States, must link any expansion of ties to progress in North Korea's nuclear disarmament. North Korea also committed to work towards the complete denuclearisation of the Korean peninsula.
U.S. defence secretary Jim Mattis said last week that the return of the 55 boxes was a positive step but not a guarantee that the bones are American.
"This is consistent with North Korea's public line, which is that its successful test program is now transitioning to mass production of nuclear and missile systems", he said.