This is a Sources Sought notice to identify potential contractors capable of providing supplies and services for Air Combat Identification Systems, specifically Common Digital Transponders (CXP) and Combined Interrogator Transponders (CIT), from FY2025 through FY2028. The work involves engineering, testing, logistics, and productionization for specific AN/APX systems, requiring intricate knowledge of their design and integration with aircraft and ship systems. The government intends to issue orders on a sole-source basis under an existing agreement with BAE Systems as the OEM, as the necessary technical data for alternative production was not procured. Performance is to begin immediately upon a contract award projected for the first quarter of FY2025. Interested vendors must submit a capabilities statement package by the specified response date to the provided email address.