This sources sought is for market research only, is not a request for proposal, and does not obligate the government to award a contract or pay for response preparation. NAVAIR PMA-265 intends to solicit Lockheed Martin for a contract modification to procure F/A-18E/F Infrared Search and Track Block II System Surrogate Aft Electronics Assemblies supporting Navy Operational Test Program Sets. The notice is being used to determine whether eligible small and/or other-than-small businesses can provide the described supplies/services before the acquisition method and RFP issuance are determined. Interested parties may email a capability statement of no more than 10 pages, including required company, contact, CAGE/UEI, business-size, socio-economic, joint-venture, and subcontracting information, marked as CUI; no phone inquiries will be accepted. Foreign concerns or U.S. firms with foreign team members/partners must comply with ITAR, and the applicable NAICS code is 336413.