This Sources Sought Notice is for market research to identify capable businesses, including small businesses, that can provide systems engineering support for integrating Mode 5, TCAS, and surveillance cloaking capability into two USMC Boeing C-40A Clipper aircraft. The anticipated place of performance is Naval Air Station Patuxent River, Maryland, with possible additional travel or support at other Government or contractor locations. The effort may include engineering analysis, integration and interface planning, configuration management, installation support, ground- and flight-test planning/execution, anomaly resolution, technical-data development, and technical program support for specified avionics equipment. Interested parties are asked to submit a concise capability statement covering company information, relevant experience with Boeing 737-derived or comparable military transport aircraft and mission avionics, technical capabilities, and teaming/acquisition input.