Provide day-to-day administration and support for Windows servers/desktops, enterprise networks, firewalls, SIEM, and virtualization in Collateral/SCI/SAP environments. Monitor systems, respond to incidents, perform vulnerability assessments (ACAS/Nessus/SCAP), maintain SOPs/TTPs, and support patching, Group Policy, and LAN/WAN operations while complying with DoD security policies.