What is the primary responsibility of the Defense Security Service (DSS)?

The primary responsibility of the Defense Security Service (DSS) is to oversee the personnel security process for the Department of Defense. This includes ensuring that those who have access to classified information are properly vetted and determined to be trustworthy. The DSS plays a critical role in protecting national security by managing the personnel security clearance process, which involves conducting background investigations and adjudications.

In contrast to managing military operations or conducting intelligence operations, which are functions typically associated with other defense entities, the DSS focuses specifically on safeguarding personnel security. While training security professionals may be a function that supports the overall mission of the DSS, it is not the primary mandate. The emphasis of the DSS on personnel security ensures that the right safeguards are in place to prevent unauthorized access to sensitive information, thereby enhancing the integrity of the defense establishment.