The Department of Defense, specifically the Naval Air Warfare Center Weapons Division (NAWCWD), is seeking proposals for the Direct to Phase II Small Business Innovation Research (SBIR) opportunity titled "Radio Frequency Real-Time Modeling and Simulation." The objective is to design and develop a modeling and simulation (M&S) system that incorporates realistic environmental responses to radar signals across a wide frequency range, enhancing the testing capabilities for advanced Electronic Warfare (EW) systems. This initiative is critical for improving the fidelity of Hardware-in-the-Loop (HWIL) simulations, which will reduce the need for open-air testing and support the development of next-generation radar and EW technologies. Interested parties must submit their proposals by June 12, 2024, with the expectation that the work may involve classified information, necessitating appropriate security clearances and facilities. For more details, visit the official solicitation page at https://www.dodsbirsttr.mil/topics-app/.