Post, update, verify, and validate investigations, clearance levels, and visit certifications using the Defense Counterintelligence and Security Agency (DCSA) systems: Defense Information System for Security (DISS), the Central Verification System (CVS), the National Background Services eApp (electronic application) new entry system for background investigations (replacing eQIP), and the Intelligence Community (IC) Personnel Security Database – Scattered Castles. Have a general knowledge of a wide range of security specialties, concepts, principles, criteria, requirements, technology, and practices in the disciplines of personnel security, information security, physical security, and Sensitive Compartmented Information Facilities (SCIF) management.