National Security Agency
From Stormravengaming
The National Security Agency/Central Security Service (NSA/CSS) is the United States government's cryptologic organization. Officially established on November 4, 1952, it is believed to be the world's largest intelligence-gathering agency. Responsible for the collection and analysis of foreign communications, it coordinates, directs, and performs highly specialized activities to produce foreign signals intelligence information, which involves a significant amount of cryptanalysis. It is also responsible for protecting U.S. government communications from similar agencies elsewhere, which involves a significant amount of cryptography.
A component of the Department of Defense, the NSA has always been directed by a three-star flag or general officer. NSA is a key component of the United States Intelligence Community headed by the Director of National Intelligence.
For a full description of the real-world agency, see the article at Wikipedia.