Acting on behalf of the Government System Owner, the ISSO develops and maintains complete, accurate, and timely RMF documentation packages in eMASS , executes continuous monitoring, manages Plans of Action and Milestones, and keeps in-scope systems (endpoint infrastructure, printers, communications, dashboards, and support platforms) reaccredited before their ATO expiration. Develop, compile, update, and maintain RMF package artifacts for assigned systems in eMASS , including the System Security Plan (SSP), Security Assessment Report (SAR) inputs, Plan of Action & Milestones (POA&M), control implementation statements, and supporting artifacts required by DoDI 8510.01 and agency A&A process documentation.