The Department of Defense, through the Defense Logistics Agency, is seeking to procure the 24K Environmental Control Unit (ECU) exclusively from Raytheon for use in support of the Patriot Missile System. This procurement is being conducted under a sole source justification due to the limited number of responsible sources available, as the necessary data for competitive bidding is not accessible. The ECU is critical for the Integrated Fires Mission Command Project, and interested firms must meet prequalification requirements to be eligible for future solicitations. For inquiries, potential offerors should contact Kimberly S. Thomas at kimberly.thomas@dla.mil or Anna Phillips at anna.phillips@dla.mil, with responses due within 15 days from the presolicitation notice.