The Space Systems Command is seeking information from potential sources capable of integrating both separable and non-separable payloads onto a Northrop Grumman ESPAStar-D class secondary payload ring/platform for missions primarily in GEO orbit. The integrator must support payloads up to the highest classified levels, including TS/SCI and SAP, and accommodate late-manifested payloads arriving less than 12 months before launch. Key work includes full payload integration, environmental testing, and support for launch and early on-orbit operations. The host platform must have a minimum 2-year operational design life and be capable of hosting at least six payloads. The performance location is not specified, and no budget information or non-bid timelines are provided.