The Department of Defense (DOD) is seeking proposals for the Proliferated Warfighter Space Architecture (PWSA) Advanced Capability Development Open Topic. The Space Development Agency (SDA) is looking for novel architecture concepts, systems, technologies, and capabilities that enable leap-ahead improvements for future tranches of currently planned PWSA capability layers or address other emerging warfighter needs. The research areas include trusted AI and autonomy, advanced computing and software, integrated sensing and cyber, hypersonics, microelectronics, integrated network systems-of-systems, space technology, renewable energy generation and storage, advanced infrastructure, and advanced manufacturing. The solicitation is open for Phase II proposals only, and proposers must demonstrate the scientific and technical merit and feasibility of their projects. The research will be conducted in multiple themes, including integrating commercial sensing to the transport layer, developing optical inter-satellite link (OISL) technology and industrial base, cybersecurity, networking, in-space processing, increasing power for spacecraft bus, generic BMC3 hardware and middleware solutions, seamless multi-level security (MLS), and high-performance clocks for space. The Phase III applications of this research include providing low earth orbit communication systems and space-based processing for the distribution of overhead sensor data. The proposal submission deadline is March 31, 2025. For more information, visit the DOD SBIR 24.4 Annual solicitation notice on grants.gov or the SDA website.