The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure eight units of an oxygen concentrator, identified by NSN 7R-1680-016102324-E7, in support of Foreign Military Sales. 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 for the part is not sufficiently available for open competition. Interested parties must provide comprehensive documentation as outlined in the NAVSUP Source Approval Information Brochures, and proposals must be submitted within 45 days of this notice, with contact for inquiries directed to Kristin Clemens at (215) 697-3814 or via email at KRISTIN.CLEMENS@NAVY.MIL.