Army Contracting Command - Redstone intends to procure, on a sole source basis, from Lockheed Martin Missiles and Fire Control (LMMFC)-Dallas, TX, Commercial and Government Entity (CAGE) Code 64059, all incidental services, hardware, facilities, equipment, and all technical, planning, management, manufacturing, and testing efforts to produce Phased Array Tracking Radar to Intercept on Target (PATRIOT) Advanced Capability-3 (PAC-3) missiles, in the Missile Segment Enhancement (MSE) configuration with associated ground support equipment (GSE) and initial spares. This contract will include base requirement in FY21 and an option for requirements in FY22 and FY23, for both United States and Foreign Military Sales (FMS) customers. The Government intends to award this requirement through other than full and open competition under the authority of Title 10, United States Code, Section 2304(c)(1), as implemented by Federal Acquisition Regulation (FAR) 6.302-1(a)(2)(ii)(A) and (B), "Only one responsible source, and no other supplies or services will satisfy agency requirements." As the developer and producer of the PAC-3 missile, only LMMFC-Dallas possesses the technical expertise, proprietary data, and experience necessary to execute this requirement. The Government intends to solicit to, and negotiate with, only one source. Offerors are encouraged to contact LMMFC for subcontracting opportunities for this effort. This synopsis is not a request for competitive quotes and a written solicitation will not be issued to any contractor other than LMMFC. As the justification for a sole source action is in accordance with FAR 6.302-1(a)(2)(ii)(A) and (B), the Contracting Officer will make a copy of the justification available on FedBizOpps within 14 days after award in accordance with the requirements of FAR 6.305(a). This requirement is not currently fully funded; the initial award and exercise of additional options will be withheld pending receipt of sufficient funds. No telephone inquiries will be accepted. Formal communications related to this acquisition should be directed to Ms. Marla J. Jacobs, Contracting Officer, [email protected]; or Christopher M. Andrews, Contract Specialist, [email protected].