Develop, review, and maintain cybersecurity documentation including System Security Plans (SSPs), Security Assessment Plans/Reports, POA&Ms, risk assessments and acceptances, continuous monitoring records, inventory, network diagrams, ports/protocols/services documentation, and supporting evidence. The Alternate ISSM will support RMF/ATO maintenance, eMASS administration, continuous monitoring, vulnerability and audit compliance, assessment readiness, and coordination technical stakeholders while reporting to the Senior ISSM/Cybersecurity Team Manager.