Bruce Hallberg holds a photo of his brother, Sgt. 1st Class Roger Hallberg, a green beret who went missing during the Vietnam War in March 1967, while his sister holds a photo of her, Bruce and Roger when they were children, outside their home in Discovery Bay, Calif., Sept. 5, 2017. Sergeant Hallberg has been missing for more than 50 years. (U.S. Air Force photo by Tech. Sgt. James Hodgman)
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