Fifty years ago today (January 27, 1973), the United States' military involvement in the Vietnam War came to an end, with the signing of the Paris Peace Accords. We mark that occasion by bringing back our episode on two brave reporters, who risked their lives and their reputations during the war in Vietnam, to reveal the truth to the American people about what was happening there. Both describe here - how and when they realized the United States government was lying about the causes and the scope of the war. And both eloquently explain their views on the role of the journalist as a witness and an adversary of government. Neil Sheehan, who died earlier this month, also talks about his role in exposing the Pentagon Papers in the pages of the New York Times. And he details why he was driven to spend over 13 years writing a definitive history of the war, called "A Bright Shining Lie," which won the Pulitzer Prize. Mr. Halberstam, who won the Pulitzer during the war, went on to write one of the other most important accounts of U.S. involvement in Vietnam: "The Best and the Brightest."