Grandson of Man on Hiroshima, Nagasaki Missions Remembers

Ari Beser, the grandson of the only U.S. crewman to fly on both the Hiroshima and Nagasaki bombing runs, is on a quest for nuclear disarmament, one that has led him to Japan — and to face-to-face encounters with survivors. Photo: Naotomo Umewaka for The Wall Street Journal