The U.S. insistence on the complete denuclearization of North Korea could work against America's interests as political pressure mounts to make rapid progress, analysts say.
Carroll said in an email that the U.S. -led U.N. Command was moving "assets" to a USA air base in Pyeongtaek, South Korea, south of Seoul, and to the Joint Security Area at the border to prepare for the process, but that plans were "still preliminary".
Meanwhile, it was sending 158 metal temporary transfer cases that could be used to send the remains home from Seoul's Yongsan Army Garrison south to Osan Air Base, the command said.
At a news conference after the meeting with Kim in Singapore, Trump announced that he would halt what he called " very provocative" and expensive regular military exercises that the United States holds with South Korea.
The official, who spoke on condition of anonymity, said it could take months and even years to identify the remains.
"Saying the North Korea problem is solved doesn't make it so".
The degree that bones have broken down is also important, and deterioration, such as from being under soil, can affect whether DNA can be recovered, he said.
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South Korean news outlet Yonhap News Agency reported that the cases would be stored in Panmunjom, a border town, for several days before they are sent to North Korea to receive the American remains.
The move follows as the USA and South Korea cancelled two more training exercises on Friday, reports the BBC.
Of those, an estimated 5,300 are believed to be in North Korea. Forensic analyses suggested none were American, the report said.
The ban on transfer of any United States assets by North Korea's leaders or its ruling party has been extended or expanded several times by both President Barack Obama and Trump himself, in response to North Korean missile tests and other actions. "But we have to get him to keep it tough", Trump said.
A Pentagon spokeswoman, Dana W White, said further decisions about military exercises in South Korea "in support of diplomatic negotiations" led by Secretary of State Mike Pompeo will depend on North Korea "continuing to have productive negotiations in good faith".
U.S. President Donald Trump speaks at a campaign rally, Wednesday, June 20, 2018, in Duluth, Minn. US officials, however, have cautioned that such actions are reversible.
But that future will be significantly influenced by China, which appeared to suggest to Trump this week that his new tariffs against Beijing could undermine us goals on the Korean peninsula. More than 36,500 United States troops died in the conflict, which lasted from 1950 to 1953.