Vietnam veteran whose wartime experiences transformed him into a pacifist and an activist. On September 1, 1987, he was nearly killed by a U.S. Navy munitions train while engaging in a nonviolent blockade in protest of weapons shipments to El Salvador. He now uses two prosthetic legs and a three-wheeled handcycle to “walk.” His new memoir is called Blood on the Tracks: The Life and Times of S. Brian Willson.