A Look Back at Reagan’s Berlin Wall Speech, 30 Years Later

Standing at the Brandenburg Gate in Berlin at the height of the Cold War, the American leader challenged his Soviet counterpart to “tear down this wall!”

Leonard Reiffel, Who Studied Lunar Nuclear Bomb, Dies at 89

Dr. Reiffel revealed that the Air Force had been interested in staging a surprise explosion on or near the moon, and that its goal was propaganda.

Leonard Perroots, General Who Defused Nuclear Crisis With Soviets, Dies at 83

He saw the signs of an elevated Soviet military alert in Eastern Europe but decided not to respond, perhaps preventing a spiral into nuclear war.