United Nations Command in South Korea is prepared to receive remains of U.S. service members from North Korea, which would be flown to Hawaii for testing and identification, Secretary of Defense James Mattis said Sunday.

A total of 158 transfer cases were sent to South Korea and would be used to send the remains home, The Associated Press reported.

“They have staged appropriate logistics materials, and we simply are standing by for whenever the diplomatic activities are done,” said Mattis, who will be visiting South Korea later in the week.

If the remains from the Korean War, fought from 1950 to 1953, are turned over at the border, they will be moved to Osan Air Base.

There they will be checked to “make sure that they appear to be what we think they are” and are from Western countries or other nations that sent troops, Mattis said.

“That will take a couple days, maybe a week,” Mattis said. Then they’ll be sent to Joint Base Pearl Harbor- Hickam, where the Defense POW/MIA Accounting agency has an large identification laboratory, the defense secretary said.

The remains turnover — the first in more than a decade — was agreed to by North Korea during Kim Jong Un’s summit with President Donald Trump.

The North agreed to “work toward” denuclearization, and the U.S. Defense Department suspended exercises with South Korea including Ulchi Freedom Guardian in August and two Korean Marine Exchange training exercises.

The remains would receive what’s known as an “honorable carry” ceremony at Hickam with flag-draped caskets escorted by military members to DPAA’s lab, the agency said.

In April 2007 North Korea returned six boxes of remains to a delegation led by former Veteran’s Affairs Secretary Anthony Principi and New Mexico Gov. Bill Richardson when they visited Pyongyang.

So far, six U.S. servicemen have been identified from the batch, DPAA said.

Between 1990 and 1994 the United States received 208 boxes of remains known as K-208 from North Korea, and out of those potential 400 individuals, 181 have been identified.

From 1996 to 2005 the United States conducted 33 “joint field activities” in North Korea using Hawaii- based personnel, with 153 identifications made out of 229 sets of recovered remains.