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Hi, I'm Keith Alexander, Director of the National Security Agency and Chief of its military components, the Central Security Service. On behalf of the men and women who work here, thank you for your interest in our work.

We are a unique national asset. Our people bring a diverse range of skills and backgrounds to achieve a common goal: to defend our nation and secure its future.

Every day, we develop and use cutting-edge technologies, translate and interpret scores of information, map and analyze networks and systems, and work side-by-side with customers ranging from our nation's senior decision makers to our troops in harm's way.

We do this important work with an unwavering commitment to protect the legal and constitutional rights of every U.S. person.

Despite the classified nature of our work, it is important that America understand what NSA does for our nation. This video will give you a better sense of our mission at the UNCLASSIFIED level. For those who require more in-depth information, classified briefings are available to Congress, the courts, the Executive Branch, and our Intelligence Community customers.

The men and women of NSA stand ready to serve. We look forward to working with you...and for you.