Camp Lejeune, N.C. was the first of several bases to experience racial violence during the Vietnam War. It led to major reforms in military racial policies.
Raul Guerra was adopted, so his DNA couldn't be matched to blood relatives. Scientists instead turned to an emerging technique that linked his bones to the drinking water in the places he grew up.
The ten-part documentary by filmmakers Ken Burns and Lynn Novick is at times graphic, and people who work with veterans say it may trigger traumatic memories for those who fought in Vietnam.
As the nation prepares to commemorate Memorial Day, more than 1600 service members remain unaccounted for from the Vietnam War. For the families of some of them, the search for answers has become a lifelong pursuit.