The Government seeks a sole-source supply of NSN 7R-1560-015415158-QE, quantity 12 EA, FOB origin, under FAR 6.302-1. The part requires engineering source approval by the design control activity because approved sources retain essential data rights, manufacturing/repair knowledge, or technical data not economically available to the Government. Alternate sources must qualify under procedures approved by the cognizant Government engineering activity. Responsible sources may identify their interest and capability or submit proposals, quotations, or capability statements, though this is not a request for competitive proposals. Award requires the offeror, product/service, or manufacturer to meet qualification requirements at time of award, and FAR Part 12 commercial-item policies are not being used, although commercial-item capability may be identified to the contracting officer.