Despite numerous health issues, survivor Kunihiko Iida, 83, has devoted his retirement years to telling his story as a way to advocate for nuclear disarmament.

Remembrances in Japan, the United States and elsewhere this week mark the only use of atomic weapons in military conflict and against civilian populations.

Eighty years after the atomic bombings of Hiroshima and Nagasaki, many of the remaining Japanese survivors are increasingly frustrated by growing nuclear threats and the acceptance of nuclear weapons by global leaders.