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EBS
In the 1980s, the Emergency Broadcast System (EBS) was a crucial part of the United States' disaster preparedness plan. The EBS test alarm was a regular occurrence, and it was designed to test the system's ability to communicate with the public in case of an emergency. The alarm was a high-pitched tone that could be heard on all radio and television stations, and it was meant to grab people's attention and let them know that something important was happening.