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Signals intelligence support is provided by the Director, National Security Agency/Chief, Central Security Service. The NSA is the U.S. government’s primary agency for foreign signals intelligence, intercepting and analyzing electronic communications and other signals to support national security and military operations. The person who leads NSA also serves as the Chief of the Central Security Service, coordinating SIGINT efforts across the DoD and intelligence community. The other options don’t fit because the Chief Information Officer handles DoD IT policy, the National Geospatial-Intelligence Agency specializes in GEOINT, and the Secretary of Defense oversees policy and resources rather than directly providing SIGINT collection and analysis.