The U.S. Department of Homeland Security is a federal agency headquartered at 3801 Nebraska Avenue Northwest in Washington, D.C. It is …
常见问题解答
问:
- What happened to the color-coded advisory system?
答:
– In 2011, the Department of Homeland Security (DHS) replaced the color-coded alerts of the Homeland Security Advisory System (HSAS) with the National Terrorism...
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