The Department of Defense, specifically the Naval Air Systems Command, is initiating a presolicitation for the Engineering Change Proposal Integration Contract (EPIC) Phase 3, aimed at providing non-recurring support for the F-35 "Lightning II" Joint Program Office. This contract will focus on redesigning structures and systems to address production and fleet deficiencies, emergent fleet issues, and improvements related to reliability, maintainability, and producibility, culminating in the development of Engineering Change Proposal packages. The contract is being pursued on a sole source basis with Lockheed Martin Aeronautics Company, the sole designer and manufacturer of the F-35 aircraft, due to their unique capabilities and proprietary technical documentation. Interested parties may submit capability statements or proposals within 15 days of the notice, and should direct inquiries to James T. Francisco or Daniel T. Haertle at the provided email addresses.