Which defense agency focuses on signals intelligence and cybersecurity?

• A. DIA, the Defense Intelligence Agency
• B. DISA, the Defense Information Systems Agency
• C. NSA, the National Security Agency
• D. DHA, the Defense Health Agency

Answer: (C)

Signals intelligence and cybersecurity are domains where NSA operates. The National Security Agency is responsible for intercepting and analyzing foreign communications and electronic signals (signals intelligence) and for protecting U.S. government information systems and communications (cybersecurity). This combination makes NSA the agency most closely aligned with both gathering intelligence from signals and safeguarding digital networks.

Other agencies have related roles but different primary focuses: DISA handles DoD information technology, network operations, and defense of military communications; DIA concentrates on defense intelligence analysis and broader intelligence collection; DHA focuses on medical services for DoD personnel.