The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking to procure ethylene, identified by NSN 1R-1680-016814004-P8, with a quantity of 5 each. This procurement is critical as the item is flight critical, requiring government source approval prior to contract award, and only previously approved sources will be solicited due to the lack of sufficient data for open competition. Interested vendors must submit detailed information regarding their capability to produce the item, including any prior source approval requests, as offers lacking the necessary documentation will not be considered. For inquiries, interested parties can contact Jessica L. Harpel at (215) 697-2995 or via email at JESSICA.HARPEL@NAVY.MIL, with proposals due within 45 days of the notice publication.