Together, Pompeo's testimony and the new assessment confirm that North Korea continues to not only produce ballistic missiles capable of threatening the United States, but also fissile material to create new warheads to sit atop those missiles. "We got back our great fallen heroes, the remains sent back today, already 200 got sent back", boasted Donald Trump earlier this summer.
Experts say the North likely wants a declaration of the end of the Korean War as part of USA security assurances.
The 55 boxes, draped in the blue and white flag of the United Nations, are each small enough to be carried in one person's arms.
The North's state media has in recent days chastised the South for failing to move more swiftly to improve inter-Korean relations while paying too much heed to the US.
In exchange for returning the U.S. war dead, North Korea may demand that the United States agree on a declaration to end the Korean War as a USA security guarantee.
The department left open the possibility that Secretary of State Mike Pompeo could meet North Korean officials during meetings of the Association of Southeast Asian Nations (ASEAN) bloc in Singapore this weekend.
The 1950-1953 Korean War was incredibly violent, with 36,940 Americans killed and another 92,134 wounded.
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Generals from the rival Koreas met on Tuesday at their shared border for talks meant to ease a decades-long military standoff, Seoul officials said.
"It certainly is something we're interested in exploring with the North Koreans", Mattis said.
The Defense POW/MIA Accounting Agency will take the remains to a lab on the base where forensic anthropologists will study bones and teeth to identify their race, gender and age. Some experts say South Korea can't agree on any drastic measures to reduce animosity unless the North takes serious nuclear disarmament steps. North Korea has nearly certainly not sent back anything close to 200 bodies.
North Korea did not take any information on where the remains were found or what items were nearby, which would have helped the DPAA in the identification process.
"I don't think North Korea is refusing to give dog tags when it has more but it probably doesn't have dog tags lying around", he said.
Trump also thanked Kim, posting his message to the North Korean dictator on Twitter last week.
It is possible, the official said, that any new missiles the North is building may be for further testing of such vehicles and of more accurate guidance systems.
USA spy agencies suspect that North Korea is building new missiles in the same research facility that manufactured the country's ballistic missiles capable of reaching the United States, according to a recent report by The Washington Post, which cited officials who spoke on condition of anonymity in order to describe classified intelligence.
The Korean War ended in an armistice, not a peace treaty. -North Korea joint efforts resulted in the recovery of 229 containers of remains.
The Post cited "intelligence gathered by USA agencies" as evidence that North Korean officials planned to try to fool the U.S.by making a show out of destroying 20 nuclear warheads while they kept dozens.