This is a sole-source procurement notice for a Firm-Fixed Price Delivery Order to Raytheon Company for engineering support and supplies related to the High-Speed Anti-Radiation Missile (HARM). The work involves sustaining engineering, technical support, and repairs to support the U.S. Navy, U.S. Air Force, and Foreign Military Sales. The justification is that Raytheon is cited as the only source with the necessary technical knowledge and data to perform this specific work. The notice is published for informational purposes only and is not a request for competitive proposals, though the government will consider information from interested parties. Companies interested in subcontracting opportunities should contact Raytheon directly.