The Department of Defense, through the Naval Sea Systems Command (NAVSEA), intends to award a sole source contract to Lockheed Martin Rotary and Mission Systems (LM RMS) for the software development of the AN/SQQ-89 Surface Ship Undersea Warfare Combat Systems (USWCS). This contract will cover a five-year period from FY25 to FY29, including one base year and four option years, focusing on the development, qualification, certification, and integration of various software baselines, specifically Advanced Capability Builds (ACB)-19, ACB-23, ACB-25, ACB-27, and ACB-29. The AN/SQQ-89 systems are critical for undersea warfare operations, and this procurement is essential for maintaining and enhancing the capabilities of the fielded systems. Interested parties should note that responses to this presolicitation notice must be submitted by 23:59 EST on October 29, 2024, via email to the primary contacts, Benjamin Vesey and Benjamin Smallenbroek, at the provided email addresses.