The NAVSUP Fleet Logistics Center Norfolk intends to acquire engineering and program support services for the Relocatable Over-the-Horizon Radar (ROTHR) systemProgram Office (RPO) in support of The Forces Surveillance Support Center (FSSC), Chesapeake, VA. The ROTHR System is a very unique radar system that uses high-frequency (HF) over-the-horizon (OTH) radar to track and detect drug trafficking activities in Northern South American and Caribbean and Gulf of Mexico basins.The FSSC RPO, whose mission it is to support ROTHR system operations, acts in all activities associated with support of the ROTHR System, including hardware/software configuration management, upgrade installation and Installation Verification and Validation (IV and V), system enhancement development, system performance diagnostics, Pre-Program-Product-Improvement (PPPI), ROTHR non-procurable parts re-engineering, ROTHR system logistic support, ROTHR-related budget and cost/benefit support, ROTHR system development, execution and upgrade, and coordination of ROTHR System improvements with international Over-the-Horizon Radar (OTHR) system efforts and other functions. The FSSC RPO requires contractor services in support of this RPO mission.The placement of an Indefinite Delivery, Indefinite Quantity (IDIQ), Cost-Plus-Fixed-Fee (CPFF), Performance-Based type contract that will allow the placement of task orders of various contract types tailored to the nature of specific, individual requirements is anticipated for a three year ordering period beginning on 1 April 2018. The applicable NAICS code is 541690 and the FSC is R408. The proposed contract action is for services for which the Government intends to solicit and negotiate with only one source (WR Systems LTD.) under authority of 10 U.S.C. 2304(c)(1), Only One Responsible Source and No Other Supplies or Services Will Satisfy Agency Requirements, as implemented by FAR 6.302-1. The required highly specialized support services include Scientific, Engineering and Technical Assistance (SETA) services, programmatic, and fiscal support services are to be procured on a sole source basis as WR Systems is the only company with the knowledge and expertise to support this very unique system in accordance with the requirements of this solicitation. The Small Business office has reviewed this market research and concurs with the acquisition strategy identified herein. Challengers may identify their interest and capability to respond to the requirement by sending challenges to Lauren Lauver at email@example.com.This notice of intent is NOT a request for competitive proposals; however, all challenges to this sole source determination by the specified response date willbe considered by the Government. Information received will normally be considered solely for the purpose of determining whether to conduct a competitive procurement. A determination by the Government not to compete this proposed contract based upon responses to this notice is solely within the discretion of the Government. The Government will not pay for information submitted in response to this notice. Furthermore, this synopsis notice also serves as a follow-up to a previously posted sources sought notice under solicitation# N0018917R0077. The fully approved Justification and Approval will be posted at the time of solicitation.