The government asks RS3 contractors to review a draft PWS for RAPTR, a rapid adaptation prototyping and threat reaction effort supporting the SIGINT and Quick Reaction Capabilities (S&QRC) Division within C5ISR ESID. RAPTR emphasizes high-velocity R&D, software-defined payloads, RF signal analysis, SI/ML for autonomous C5ISR systems, and rapid prototyping to expedite C5ISR capabilities. The RFI seeks potential sources and technologies for tasks including systems engineering and requirements modeling, conceptual system design, signal analysis, prototype hardware/software, containerization and DevSecOps, precision fabrication/integration up to TRL 6, field and developmental flight testing, cybersecurity risk planning and vulnerability emulation, and AI/ML signal-processing pipeline integration. S&QRC projects are directed by a Government Project Lead with integrated project teams of government and contractor personnel, and the operational mission spans CONUS, OCONUS, and designated Hazard Duty Combat Zone areas. This is an informational planning request to help develop a viable RFP; it is voluntary, does not constitute a commitment or award, and proprietary information should not be submitted.