The Defense Logistics Agency (DLA) anticipates issuing a Letter RFP Solicitation to add on to a 10-year Indefinite Delivery Requirements (IDR), Firm-Fixed Price (FFP) subsumable contract for 13 parts in support of the Patriot Missile System. The contract requires design, build, and supply of parts, as well as other functions including inventory management, forecasting, distribution, storage, reliability improvements, engineering maintenance, and design control affecting these parts. • The parts to be procured include Electron Tube, Power Supply, Microwave Assembly, Amplifier, Seeker Section, High Voltage Divider Assembly, Transformer Assembly, Dummy Load, Guidance Section Group, Head Control, Inverter Subassembl, Electronic Component Assembly, and Digital Intermediate Frequency Receiver. • The contract is sole sourced to Raytheon Company, the original equipment manufacturer (OEM) for the listed parts. • All offerors must meet prequalification requirements in order to be eligible for the award. • The U.S. Army Combat Capabilities Development Command Aviation & Missile Center’s System Readiness Directorate is the engineering source authority for source approvals.