Lead day-to-day operations and administration of classified DoD/SAP networks and systems. Architect, install, and maintain LAN/WAN, servers, hypervisors, SIEMs, and monitoring tools; manage patching, vulnerability scanning, and security assessments to sustain JSIG/RMF ATOs. Create O&M checklists, SOPs/TTPs, support incident response, and provide technical user support. Requires SAP experience and work in PL2-PL4 environments.