The 1st Contracting Squadron at Langley Air Force Base intends to award a sole source contract to Raytheon Company for troubleshooting and repair of a PSC-5C Tactical Radio System with proprietary imbedded cryptographic equipment and data. The procurement is authorized under FAR 6.302-1. The Government believes that only one responsible source can provide the service that will satisfy the agency requirements. A Justification for Other than Full and Open Competition has been prepared in support of this acquisition. Firms that recognize and can provide the required work described above are encouraged to identify themselves and give written notification to Contracting Officer. This notice is not a request for competitive quotes. All responses received within 3 days of the date of publication of this synopsis will be considered by the Government. Supporting evidence must be furnished in sufficient detail to demonstrate the contractor's capabilities and the ability to comply with with the above requirement.