The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure three units of the Receiver-Transmitter (NSN 7R-5821-014178763-FX, REF NR 622-8149-003). This procurement requires engineering source approval due to the flight-critical nature of the item, necessitating that only approved sources may submit proposals, as the technical data necessary for full and open competition is not available. The item is vital for maintaining quality and operational integrity, and interested parties must provide detailed documentation to demonstrate their capability and compliance with the source approval requirements. Proposals must be submitted within 45 days of the notice, and inquiries can be directed to Sara M. Hojnowski at (215) 697-2198 or via email at SARA.HOJNOWSKI@NAVY.MIL.