The Department of Defense, specifically the Department of the Army, is seeking support for the Phased Array Tracking Radar to Intercept on Target (PATRIOT) Component Software Build (PCSB) System Ground and Flight Test. This procurement involves system-level testing, data analysis, problem resolution, and flight test support, which are critical for ensuring the operational effectiveness of the PATRIOT missile system. Lockheed Martin Missiles and Fire Control is identified as the sole source for this effort due to its unique expertise and possession of the necessary technical data package, which precludes full and open competition. Interested parties with questions should reach out to Contracting Officer James Casper at james.s.casper3.civ@army.mil or Contract Specialist Lany Gonzales at lany.g.gonzales.civ@army.mil for further information.