An Ik San, center, crosses to southern side for the meeting with South Korea at the border village of Panmunjom, South Korea, Tuesday, July 31, 2018.
Numerous fallen service members died in North Korea and were buried by their comrades where they fell.
The remains were first flown from the North Korean city of Wonsan last Friday, on the 65th anniversary of the armistice, and were greeted at Osan Air Base by hundreds of USA service personnel and their families.
The official did not know details about the single dog tag, including the name on it, or whether it was even that of an American military member.
"So when. only one dog tag was provided, it's probably not to tease the USA but rather that it was sent because it could offer clues to the remains".
Ahn Ik-san, the general leading the North Korean delegation at the military talks, noted South Korean news reports suggesting that he might try to persuade the South to push for a joint declaration with the United States to formally end the war.
What deal has been struck?
The remains were transferred by North Korea last week, the first tangible moves from agreements reached between President Trump and North Korean leader Kim Jong Un at their meeting in Singapore on June 12.
News that the North Koreans are potentially developing new weapons would be a heavy blow to President Donald Trump's efforts at diplomacy with North Korean dictator Kim Jong Un.
"It's hard to live your life not knowing what happened to your loved one", the daughter of one missing serviceman told the BBC earlier.
Vice President Mike Pence, the son of a Korean War combat veteran, will attend the ceremony at Joint Base Pearl Harbor-Hickam in Hawaii.
Honor guards carry the remains of US servicemen killed in the Korean War and collected in North Korea, during a ceremony at the Osan Air Base in Pyeongtaek, South Korea.
The daughter of former president Megawati Soekarnoputri, who has continued to maintain the friendship with North Korea after her father Sukarno's reign, Puan seized the opportunity to congratulate North Korea's government and its people on the 70 anniversary of the nation's founding, which falls on September 9.
How many USA servicemen are missing from the Korean War? Satellite images and previous reports about a secret uranium enrichment facility suggest that the North Koreans are upgrading their arsenal from a research facility located just outside of Pyongyang.
Sixteen other countries sent troops to fight in the 1950-53 Korean War under the United Nations umbrella, and several of them also are believed to have been lost in the North. "They have missing, France has missing, Americans have". The US has repeatedly rejected global calls for sanctions relief on North Korea.
Bill Richardson, a former United Nations ambassador who secured the return of six bodies in 2007, told the Washington Post that Pyongyang is unlikely to release them all without conditions.
The US State Department has said it is committed to building a peace mechanism in place of the armistice when the North denuclearises.