The ISSO will support the implementation, documentation, assessment, and testing of applicable Information Assurance (IA) security controls; develop and maintain required security artifacts, including network topology diagrams, hardware and software inventories, ports and protocols lists, and Plans of Action and Milestones (POA&Ms); conduct and support vulnerability assessments and Defense Information Systems Agency (DISA) Security Technical Implementation Guide (STIG) compliance reviews; track and coordinate remediation activities; and support Interim Authorization to Test (IATT) and Authorization to Operate (ATO) processes in coordination with the Information System Security Manager (ISSM), Authorizing Official (AO), and other system stakeholders. About the Role: The Cybersecurity/Information System Security Officer (ISSO) will provide Cross Domain Solutions (CDS) Network Architect Certification and Accreditation (C&A) support and oversee day-to-day cybersecurity operations and Risk Management Framework (RMF) activities for assigned information systems, including classified and cross-domain environments at the Secret level and below.