Before the remains were put on military planes bound for Hawaii, hundreds of US and South Korean troops gathered at a hanger at the Osan base in South Korean for the repatriation ceremony.
The Trump administration downplayed reports Tuesday that North Korea is engaged in a flurry of new intercontinental ballistic missile activity, asserting the activity has not undermined President Trump's high-stakes diplomatic outreach to Pyongyang.
The process of identification could take years, according to experts. And I want to thank Chairman Kim for keeping his word.
"When you're engaged in this kind of negotiation. countries just don't stop everything and wait to see how the negotiation turns out", Wit told AFP.
Vice President Pence will take part in an Honorable Carry Ceremony for the remains when they arrive on Wednesday.
If the reported North Korean nuclear activity seems inconsistent with what went down at the meeting in Indonesia, it's because Trump oversold the progress he made there.
However, the cases only include one dog tag, so the identifying process could be hard and may take yeas to complete.
Another North Korean expert from MIIS, Melissa Hanham, told the BBC that the facility had "regular traffic in and out of the building", adding that this "traffic pattern" on the site stayed "about the same through the Panmunjom and Singapore meetings".
"Offer up 20 first-gen warheads, claim you are or have disarmed, but keep the good stuff in presumably clandestine facilities and hope they aren't discovered", Narang said.More news: European Union observers offer mixed picture of first Zimbabwe vote since Mugabe exit
The returned material also included military hardware and uniforms, including helmets, water bottles and boots. Some of them, including Australia, Belgium, France and the Philippines, have yet to recover some of their war dead from North Korea. Most died on the battlefield and were buried in shallow graves or in cemeteries that were meant to be temporary, but some also perished in POW camps run by North Korea or China, experts say.
More than 326,000 Americans fought alongside soldiers from South Korea as part of a United Nations coalition during the war to support the South against the Communist North. Defense Secretary Jim Mattis said last week that it was possible some of the remains could have come from those nations, and if so, they would be repatriated once they have been identified.
Patrick Chovanec, an adjunct professor at the Columbia School for International Affairs, recently found himself struck by a piece of Donald Trump fan art created by a Trump supporter.
More than 7,700 US troops remain unaccounted for from the Korea War.
Kim handed over more than 55 boxes carrying remains of United States soldiers killed in the 1950-53 Korean War on Friday.
President Moon "will consider attending, with circumstances such as future schedule in mind", said South Korean presidential spokesman Kim Eui-kyeom.
They also discussed ways to turn the skirmish-prone West Sea by ceasing firing exercises and withdrawing artillery along the shore, according to South Korea's Defence Ministry.
Some of the sites around North Korea are well known, and their continued use and expansion is an obvious sign that North Korea is not yet making any serious moves to cut back production or deployment of nuclear weapons.