The first BMEWS radar complex, located at Thule Air Base, Greenland, had come online that week, and the numerical threat levels of the new warning system were being explained to the businessmen. If the number 1 flashed in red above the world map, unidentified objects were traveling toward the United States. If the number 3 flashed, the threat level was high; SAC headquarters and the Joint Chiefs of Staff had to be notified immediately.

The maximum threat level was 5—a computer-generated warning, with a 99.9 percent certainty, that the United States was under attack. As Peterson sat in the commander’s chair, the number above the map began to climb.

When it reached 4, NORAD officers ran into the room. When it reached 5, Peterson and the other executives were quickly escorted out and put in a small office. The door was closed, and they were left there believing that a nuclear war had just begun.

— Eric Schlosser, Command and Control