The Department of Defense, through the Naval Supply Systems Command Fleet Logistics Center Norfolk, is seeking to procure engineering support services for the Washington Interagency Very Long Baseline Interferometry (VLBI) Correlator, with a sole-source contract intended for the Massachusetts Institute of Technology (MIT). The primary objective of this procurement is to secure specialized software support, assistance with electronic VLBI capabilities, data storage and validation, and upgrades to the Mark6 operating systems, all of which are critical for maintaining the integrity and security of geodetic VLBI data used by the U.S. Naval Observatory. This initiative is vital for enhancing the observatory's capabilities in processing Earth orientation parameters, which are essential for defining celestial and terrestrial reference frames, thereby supporting national security objectives. Interested parties may submit proposals, although the contract will not be awarded through competitive bidding, and inquiries can be directed to Jordan Walton at jordan.l.walton.civ@us.navy.mil. The contract is set for a one-year period from May 1, 2025, to April 30, 2026.