DISA/DITCO intends to negotiate a sole source contract with SAIC for commercial Unisys System Services, with a Justification & Approval to be posted on SAM.gov once approved. This acquisition will continue Unisys OS 2200 System Services for DISA HaC under a current contract that expires November 30, 2026. It will support a strategic partner base of more than 3,000 users worldwide relying on Unisys OS 2200 applications critical to warfighter support. The effort covers a complete managed service with sufficient flexibility and scope to meet current and future OS 2200 workloads, security, training, and modernization needs. The contractor must ensure DISA customers receive uninterrupted, continuous access to their applications and data.