Defense Counterintelligence and Security Agency

The Defense Counterintelligence and Security Agency (DCSA) is a federal security and defense agency of the United States Department of Defense (DoD) that reports to the under secretary of defense for intelligence. DCSA is the largest counterintelligence and security agency in the federal government and is responsible for providing personnel vetting, critical technology protection, counterintelligence, training, and education and certification.

Source: Wikipedia — Defense Counterintelligence and Security Agency (CC BY-SA 4.0)