This is a Sources Sought notice for planning purposes to identify potential contractors for the development, maintenance, sustainment, and modernization of integrated capabilities for Mission Deltas 2 and 3, focusing on space domain awareness and electromagnetic warfare. The scope includes strategic pillars like space electromagnetic warfare systems and system engineering/integration, as well as common supporting functions such as cyber hygiene and logistics. The government seeks information on contractor experience in areas like depot sustainment, DevSecOps, and contract types, with a classification range from unclassified to Top Secret SCI. Responses are requested via a provided Microsoft Forms link and a PDF, with an interest in small business participation for supporting functions.