The U.S. Government is conducting market research to identify potential sources with the expertise, capabilities, and experience to qualify and produce an X-Band Cross Over Network. Security clearance requirements and foreign participation have not been determined, but contractors should anticipate working with military, civilian, national partner, and contract personnel from various services and agencies. This Sources Sought notice is for informational purposes only; it is not an RFP, RFQ, or IFB, does not commit the government to award, and no funds are available to prepare responses. Supporting documents include the requirement description, technical data package, and a Contractor Capability Survey, with both large and small businesses encouraged to participate and no small-business set-aside decision yet made. Respondents should address teaming, partnership, joint venture, or subcontracting arrangements and identify areas suitable for small-business breakout, with questions submitted in writing to the contracting officer and specified contacts.