The Department of Defense, through the Naval Supply Systems Command (NAVSUP) Weapon Systems Support, is soliciting proposals for the repair and modification of the tail gearbox, specifically from Sikorsky Aircraft Corporation. This procurement is classified as a sole source requirement due to the government's inability to contract with other sources, as it lacks sufficient data to do so; therefore, only approved sources may submit proposals. Interested parties must provide the necessary documentation as outlined in the NAVSUP WSS Source Approval Brochure, which is available online, to be considered for the award. For further inquiries, contact Jacob Wells at jacob.r.wells1@navy.mil or by phone at 215-697-1227, with the solicitation period extended by 30 days.