The Government intends a sole-source procurement under FAR 6.302-1 for NSN 7R-1680-015527073-GF, reference 188856-5, quantity 15 EA, delivered FOB Origin. The item is flight critical, the Government lacks rights to the necessary data, and reverse engineering is uneconomical, so Government source approval is required before contract award. Only previously approved sources have been solicited, and new-source approval normally cannot be completed in time to avoid delaying award. Non-approved sources must submit the required NAVSUP WSS Source Approval Brochure information with their proposal, and offers missing required data or prior-submission documentation will not be considered. Although FAR Part 12 commercial-item policies are not being used, interested parties may identify their interest and capability to satisfy the requirement with a commercial item.