What is NBIS The National Background Investigation Services (NBIS) is the federal government’s end-to-end information technology system for personnel vetting. NBIS will be used for initiation, application submission, background investigation, adjudication, and continuous vetting; an all-in-one consolidated system. The DOD Consolidated Adjudications Facility (CAF) is working hand-in-hand with the NBIS team to plan for the phased transition of adjudications from the Defense Information System for Security (DISS) to NBIS.