Lead and perform installation, architecture, and day-to-day administration of LAN/WAN and classified DoD networks (Collateral/SCI/SAP). Manage SIEM, monitoring tools, patching, vulnerability scans, RMF assessments, incident response, virtualization, servers, and security hardening. Provide technical support, create O&M checklists, SOPs/TTPs, and support accreditation/continuous monitoring for secure environments.