The Department of Defense, through the United States Space Force, is seeking market capabilities for the Global Positioning System (GPS) Control-Segment Sustainment III (GCS III) under a Sources Sought Request for Information (RFI). This procurement aims to identify potential contractors capable of providing systems engineering, software and cybersecurity engineering, maintenance services, and operational support for the GPS Control Segment, with tasks including sustaining operations at control and monitoring stations and modifying software and hardware. The anticipated contract will be an Indefinite Delivery/Indefinite Quantity (IDIQ) agreement, likely spanning five years with potential extensions, and interested suppliers, particularly small and disadvantaged firms, are encouraged to submit Statements of Capability by July 31, 2025. For further inquiries, interested parties may contact Matthew R. Buchanan at matthew.buchanan@spaceforce.mil or Christopher Cook at christopher.cook.62@spaceforce.mil.