Lao Cai, July 14 -- As part of the nationwide 500-day campaign to intensify the search for, recovery and identification of fallen soldiers' remains, the northern province of Lao Cai has completed the collection of biological samples from unidentified graves and launched a large-scale drive to obtain DNA samples from more than 3,400 relatives of martyrs whose identities have yet to be confirmed. Each DNA sample represents a renewed hope and another step towards reuniting the nation's fallen heroes with their families and hometowns. A half-century of longing Beginning on July 13, Lao Cai launched a province-wide campaign to collect DNA samples from relatives of unidentified war martyrs to support efforts to identify their remains. Sampling ...