If the color-alert system became something better defined, so that people know exactly what caused the levels to change, what the change means, and what actions they need to take in the event of a change, then it could be useful. The threat levels actually do more harm than good, by needlessly creating fear and confusion (which is an objective of terrorists) and anesthetizing people to future alerts and warnings. Even local police departments and government organizations largely have no idea what to do when the threat level changes. People are left to worry, or are given nonsensical instructions to buy plastic sheeting and duct tape. The color-alert system, on the other hand, is not tied to any specific actions. The difference is that the DEFCON system is tied to particular procedures military units have specific actions they need to perform every time the DEFCON level goes up or down. military has a similar system DEFCON 1-5 corresponds to the five threat alerts levels: Green, Blue, Yellow, Orange, and Red. The color-coded threat alerts issued by the Department of Homeland Security are useless today, but may become useful in the future. I wrote about the DHS’s color-coded threat alert system in 2003, in Beyond Fear: Modifying the Color-Coded Threat Alert System
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