From the notice

NSN --014378169-, TDP VER 001, REF , QTY 2 , DELIVERY FOB Origin (Shipping Point) This is a sole source requirement. The Government physically does not have in its possession sufficient, accurate, or legible data to contract with other than the current source. One or more of the items under this acquisition are subject to Free Trade Agreements. (FAR 52.225-3). One or more of the items under this acquisition are subject to the World Trade Organization Government Procurement Agreement and Free Trade Agreements. (FAR 52.225-5). These items require Government Source Approval prior to award. If you are not an approved source, you must submit, together with your proposal, the information detailed in the NAVSUP WSS Source Approval Brochure which can be obtained on the internet at [link] . Offers received which fail to provide all data required by the source approval brochure will not be considered for award under this solicitation. For information or questions regarding this notice, please contact [email].