This is a market research notice for Patriot Missile System spares, indicating the government currently intends to award a sole-source contract to Raytheon. The performance location is not specified. The notice seeks to identify all potential qualified sources, including small businesses, for possible future competitive opportunities. Interested firms must meet prequalification requirements and are responsible for significant upfront engineering and production costs. This is not a solicitation, and no funds are available for response preparation.