The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of two units of the Air Flask Assembly, identified by NSN 7R-1720-004915800-EY. 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 the primary contact for inquiries being Danielle M. Junod at danielle.m.junod.civ@us.navy.mil. The contract will be awarded only to those who meet the qualification requirements at the time of award, and the government reserves the right to proceed with the procurement based on fleet support needs if necessary approvals cannot be processed in time.