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Al-Qaeda is a transnational Sunni Islamist terrorist network operating in over 60 countries around the world. At the center of the web is the core group, which I will refer to as Al-Qaeda Central (AQC), a disciplined, highly professional cadre of committed revolutionaries, which now probably consists of fewer than 1,000 dedicated members, and perhaps fewer than 500. Although it has become the most hunted terrorist group in world history since its September 11, 2001, attacks and has been severely degraded by substantial losses, it remains a resilient and potent threat to the United States.