Tier 3 Systems Administrator Location: San Antonio, TX Clearance Required: Public Trust (ADP/IT-II); Tier 3 Investigation (NACLC) Program Overview The Defense Health Agency’s Domain and Directory Services Branch (DDSB) supports the global IT infrastructure that underpins medical readiness for the Army, Navy, and Air Force. This includes sustaining both on-premise and cloud-based environments serving over 200,000 users and 250,000 end-user devices across 250 sites worldwide. DDSB manages core id…