5 DEFCON FIVE CODE BLUE DEFENSE NORMAL CONDITION MILITARY WARNING STATE OF READINESS FOR NUCLEAR WORLD WAR GAME OVER FIRST SECOND STRIKES

DEFCON Levels

DEFCON Levels and What the Current DEFCON Level Means

Defense R&D OUTLOOK by Faircount Media Group - Issuu

What do the DEFCON ratings of 1-5 mean? - Quora

The 5 Conditions of 'Defense Readiness' - The New York Times

DEFCON Levels and What the Current DEFCON Level Means

NationStates, Dispatch

DEFCON Levels

False Warnings of Soviet Missile Attacks Put U.S. Forces on Alert in 1979-1980