The Naval Air Systems Command (NAVAIR), Patuxent River, MD, intends to award a sole source Firm-Fixed Priced (FFP) Delivery Order (DO) under Basic Ordering Agreement (BOA), N00019-25-G-0009 to Raytheon Company for the procurement of supplies and services for the High-Speed Anti-Radiation Missile (HARM). The BOA order will provide supplies and services to support the U.S. Navy (USN), U.S. Air Force (USAF), and Foreign Military Sales (FMS) supporting sustaining engineering of the HARM Depot Guidance Section/Control Section (GS/CS) repair capabilities. The supplies and services to be procured under this BOA order will include engineering sustaining support and services; technical support; Government Furnished Factory Test Equipment (GFFTE) diagnostic support and repairs, and Engineering Change Proposals (ECPs) as required. These requirements will be procured in accordance with the statutory authority permitting other than full and open competition under Title 10 U.S.C. 3204(a)(1), as implemented by FAR 6.103-1, “Only one responsible source and no other supplies or services will satisfy agency requirements.” As the sole designer, developer and manufacturer of HARM, Raytheon Company is the only source that currently possesses sufficient requisite knowledge, engineering expertise, aircraft integration information, and technical data required to perform these efforts. No other source has the technical qualifications and necessary resources to perform the work described herein, nor will any other supplies or services satisfy the Government's requirement. This synopsis is published for informative purposes (THIS IS NOT A REQUEST FOR COMPETITIVE PROPOSALS). Interested parties, however, may identify their interest and capability by responding to the requirement. The Government will consider all information received prior to the closing date of this synopsis. Information received will be considered solely for the purpose of determining whether to conduct a competitive procurement. A determination by the Government not to compete the proposed contract based upon responses to this notice is solely within the discretion of the Government. Companies interested in subcontracting opportunities should contact Raytheon directly. There are no commitments by the Government to issue any solicitations, make an award or awards, or to be responsible for any monies expended by any interested parties before award of a contract for the efforts mentioned above. Information provided herein is subject to change and in no way binds the Government to solicit for or award a contract. No telephone responses will be accepted.