The U.S. Naval Observatory seeks qualified sources to provide software upgrades for Time and Frequency Reference Measurement Systems (TFRMS). A Firm-Fixed-Price, Single Award contract is anticipated under NAICS code 334519. Responses, including capability statements, must be emailed to Ms. Jordan Walton by 12:00 PM EST on May 7, 2026. No budget amount is specified, and the location for performance is not mentioned. This is a sources sought notice only, not a solicitation for proposals.