51.  In this scenario, the United States and Russia together would reverse decades of treaties aimed at reducing the threat of nuclear attack by eliminating multiple warheads.

52.  In those days of the Cold War, civil defense meant preparing for a nuclear attack and its aftermath.

53.  It began as a child of the Cold War -- a headless, decentralized data network designed to function in the aftermath of all-out nuclear attack.

54.  It is a national security problem that deserves the kind of attention the Pentagon devotes to threats of military nuclear attack or regional aggression.

55.  It supposedly had an underground area where U.S. government officials would go in case of a nuclear attack.

56.  It was designed in the Cold War to survive a nuclear attack by automatically rerouting information around damaged areas.

57.  It was meant to be invulnerable to nuclear attack.

58.  Its message is that the United States is vulnerable to a nuclear attack from China because the Clinton administration traded away national security in return for campaign contributions.

59.  It took the Russians eight minutes to decide that the rocket was not the leading edge of a nuclear attack.

60.  Its paramount concern was to secure itself against possible nuclear attacks by third countries while Russia was free either to join in or end up on the sidelines.