The National Institute of Standards and Technology (NIST) intends to negotiate a sole-source contract with Menlo Systems, Inc. for Optical Frequency Comb System Services, as outlined in a Special Notice. This procurement aims to establish a one-year service agreement, with options for two additional years, to ensure continued operational integrity of the optical frequency comb system following the expiration of its warranty. The services will include prioritized remote and onsite support, with specific requirements for rapid response times and adherence to safety protocols, primarily conducted at NIST's Boulder, Colorado location. Interested parties capable of fulfilling these requirements must submit their capabilities in writing to the primary contact, Lisa Stevens, at lisa.stevens@nist.gov by the response deadline, with an estimated award date of May 31, 2025.