The Department of Defense, through the Defense Logistics Agency (DLA) Aviation at Philadelphia, PA, is seeking to procure two rotary couplers under a presolicitation notice. The procurement involves a specific National Stock Number (NSN 7R-5985-016600367-E7) and requires that the item be sourced from approved suppliers due to its flight-critical nature and the lack of available technical data for alternative sources. This item is essential for military applications, and the government intends to negotiate with only one source, emphasizing the importance of prior government approval for any new suppliers. Interested parties must submit their proposals, including necessary source approval documentation, to Michael Kneble at DLA by the specified deadlines, with a focus on ensuring compliance with the outlined requirements to be considered for the contract.