The Defense Logistics Agency is seeking sources for a potential 10-year sole-source contract to support the F135 Propulsion System, with a five-year base and five-year option period. The contract would cover consumable and depot-level repairable spare parts, plus ancillary services like supply chain forecasting, for approximately 3,500 sole-source items from Pratt & Whitney and 435 competitively managed items. Performance location is not specified, and no budget amount is provided. Responses are due by 06/08/2026, and interested parties must demonstrate capability in F135 engine sustainment, access to proprietary data, and willingness to provide long-term pricing. The government intends to negotiate only with Pratt & Whitney but invites other firms to express interest and capability.