The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the procurement of two units of the SHAFT ASSEMBLY, DRIV, identified by NSN 7R-1615-012429604-VH and reference number 70361-23001-048. This procurement requires engineering source approval due to the flight-critical nature of the item, necessitating that only approved sources may submit proposals, and any new sources must undergo a qualification process as outlined by the Government engineering activity. The contract is intended for supplies that are essential for maintaining the quality and performance of military helicopter rotor blades and drive mechanisms. Interested parties must submit their proposals, including necessary source approval documentation, to Leah L. Brown at NAVSUP WSS by the deadline of 45 days from the notice publication, with the understanding that the Government may proceed with award based on Fleet support needs if new source approvals cannot be processed in time.