Scientists in Hawaii are examining the skeletal remains in North Korea returned to the US last month.
But those trying to identify the remains say they are aware it is an extremely sensitive project that demands the utmost care.
Researchers say each of the 55 boxes North Korea returned contained bones from severeal people.
They will first undergo DNA testing.
Researchers say that is just the first step in the process.
About 20 of the 55 boxes held remains from one mass grave near North Korea Chosin Reservoir.
“They all appear to have the same sort of coloration on the exterior of the bones. So it does appear that these were all buried together at one point in time,” says Greg Berg from the Defense POW/MIA Accounting Agency.
The anthropologists working on the project have already identified many US soldiers who fought in the Korean WAr.
They say it could take years to finish the work.