dpaa teams search around the world for remains from conflicts dating back to world war ii. >> there are currently close to 82,000 that are still missing of which we believe 38,000 are recoverable. chris: how do you determine whether or not remains are recoverable or not? >> so our historians will comb through battlefield records, archival information and if they're able to narrow down an area, we can send an archeologist or anthropologist with which to conduct a field recovery. chris: there are case files on every one of the missing and the work combines international diplomacy with csi technology. >> we will look at anthropology, we will look for dna association, material evidence, clavicle matching, as well as stable isotope analysis. chris: some 15% of our nation's unknown are buried in places