The Sr. Tier 2 Helpdesk Specialist joins the I3TS program to provide enterprise-wide IT support for the DTRA Information Management & Technology Directorate. This role involves installing, operating, maintaining, troubleshooting, and providing cybersecurity defense for data and applications hosted on both classified and unclassified systems. Daily responsibilities include performing root-cause analysis for complex remote and deskside incidents, resolving VDI issues on SIPR thin clients, managing network printing faults, and executing large-scale desktop installation projects. The candidate will also author Knowledge Base Articles and mentor peer technicians. Required skills and tools include experience with IT ticketing systems, remote desk takeover tools, Windows environments, and advanced PowerShell or scripting. The role operates within a high-profile defense contract context, ensuring all technical interventions comply with ITSM, ITIL, and information systems security protocols to support mission capabilities.