Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a not-to-exceed $228,680,862 cost-plus-award-fee and cost-plus-fixed fee undefinitized modification (P00074) to a previously awarded contract (N0001919C0010). This modification adds scope for the development of F-35 training systems and simulation block 4 capability development, to include Joint Strike missiles, weapons, integrated fire control, F-35 Lightning Integrated Training Environment, and additional training development required to meet a Lot 17 delivery. Work will be performed in Orlando, Florida (70%) and Fort Worth, Texas (30%), and is expected to be completed in December 2025. Fiscal 2022 research, development, test and evaluation (Air Force) funds in the amount of $11,114,668, fiscal 2022 research, development, test and evaluation (Navy) funds in the amount of $11,114,666, and non-U.S. Department of Defense partner funds in the amount of $5,662,710 will be obligated at the time of award, none of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.