National Security Agency/Central Security Service (NSA/CSS) by the United States Department of Defense

The National Security Agency/Central Security Service (NSA/CSS) is a U.S. government agency responsible for signals intelligence (SIGINT) and information assurance. It operates under the United States Department of Defense and is one of the principal intelligence agencies of the U.S. government. The NSA and CSS are two separate entities, but they are often discussed together due to their close collaboration and complementary missions.