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Khe Sanh, South Vietnam: Riding on a self-propelled 175mm gun, these soldiers lead an American column into the base of Khe Sanh 2/1. The mechanized unit is protected by helicopter gunships (background). The soldiers are involved in the current allied offensive in the northern South Vietnam area. February 4, 1971 1971-02-04 Vietnam Vietnam War, 1961-1975 Image BW Photograph, 8.5 x 11