The remains returned to US soil are part of a deal struck between President TrumpDonald John TrumpTrump to visit OH to campaign in special House election CNN's Acosta: I'm anxious Trump's rhetoric toward media "will result in somebody getting hurt" Trump shares son's tweet backing supporters chanting "CNN sucks" MORE and North Korean leader Kim Jong Un.
"And I'm sure that he will continue to fulfill that promise as they search and search and search", said Trump, who has sent Vice President Mike Pence to Hawaii to receive the remains. Some experts say South Korea can't agree on any drastic measures to reduce animosity unless the North takes serious nuclear disarmament steps.
"At this moment, a plane is carrying the remains of some great fallen heroes from America, back from the Korean War", Mr. Trump said Friday.
"Today, our boys are coming home", Pence said, adding that the 55 remains arriving in the U.S. on Wednesday "are the heroes who will lead the way to many homecomings in the future". Kim pledged the "complete denuclearization of the Korean Peninsula", at the summit, but the short agreement said nothing about inspections or a verification process to make sure North Korea follows through.
However, identifying the remains could take years to accomplish, and in previous instances, North Korea reportedly turned over the remains of animal bones, according to Daily Mail report published in June that cited the memoirs of a North Korean diplomat who fled to South Korea in 2016.
The remains had been transferred from the small boxes they arrived in on Friday into full-sized caskets, draped with United Nations flags.
Other countries under the command of the United Nations also have troops that are still unaccounted for, including the UK, Australia and Canada.
The returned remains are seen as one major accomplishment of Trump's historic summit in Singapore with North Korean dictator Kim Jong Un last month.
Some of the remains may prove not to be American, but may instead belong to service members from other allied countries who participated in the war against North Korea and China.
Experts say positively identifying the decades-old remains could take anywhere from days to decades.
But North Korea only provided one dog tag with the 55 boxes it handed over last week.
"With these 55 sets of remains that are being repatriated, there was one single soldier's dog tag", NPR's Anthony Kuhn reported from the Osan Air Base.
Intercontinental ballistic missiles are seen at a grand military parade celebrating the 70th founding anniversary of the Korean People's Army at the Kim Il Sung Square in Pyongyang, in this photo released by North Korea's Korean Central News Agency (KCNA) February 9, 2018. "Don't worry or hesitate", said Syafruddin, who like many Indonesians goes by only one name.
The cases were placed on stanchions in a Hickam hangar, where veterans of the 1950-53 Korean War and families of the missing observed the event.
A series of US-North Korean recovery efforts, termed "joint field activities", between 1996 and 2005 yielded 229 caskets of remains, of which 153 have been identified, according to the Pentagon. North Korea is not negotiating to give up their nuclear weapons.
The returns of f dozens of servicemen who were killed in the Korean War.
United States 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.
An armistice that ended the Korean War has yet to be replaced with a peace treaty, leaving the peninsula in a technical state of war.
But his comment seemed at odds with his own secretary of state, Mike Pompeo who said any such step would have to be confirmed by global inspectors and that North Korea continued to produce fuel for nuclear weapons despite Kim's pledge to denuclearize.