The DISS system stands for the Defense Information System for Security. DISS is┬áthe system of record to perform comprehensive personnel security, suitability and credential eligibility management for all Military, civilian, and DOD contractor personnel. In other words, DISS is the online, secure database of U.S.A. persons’ security clearances and public trust determinations. DISS provides secure communication between Adjudicators, Security Officers and Component Adjudicators. It is administered by the Defense Counterintelligence and Security Agency (DCSA).