The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Philadelphia, is seeking proposals for the procurement of 13 units of the SLING HOOK, UNDERSLU, identified by NSN 7R-1680-016925943-H5. This procurement is critical as the item is flight critical and requires Government source approval prior to contract award due to its unstable design and marginal performance during tests, necessitating major changes that may render the current part obsolete. Interested vendors must provide detailed technical data and source approval information with their proposals, as only previously approved sources will be considered for this contract, which is not open for competitive proposals. For inquiries, interested parties can contact Aisha J. Varnadore at (215) 737-4834 or via email at Aisha.Varnadore@dla.mil, with proposals due within 45 days of this notice.