Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $97,469,822 cost-plus-incentive-fee, cost-plus-fixed-fee modification (P00015) to a previously awarded contract (N0001919C0074). This modification adds scope to procure Block 4 special tooling and test equipment in support of non-U.S. Department of Defense (DOD) participants and Foreign Military Sales (FMS) customer’s F-35 Lightning II delivery schedules. Work will be performed in New Hampshire (41%); Texas (21%); California (10%); Oregon (7%); Tennessee (7%); undisclosed location (4%); Israel (3%); Michigan (2%); Washington (2%); Netherlands (1%); Massachusetts (1%); and United Kingdom (1%), and is expected to be completed in December 2024. Fiscal 2021 aircraft procurement (Air Force) funds in the amount of $24,107,861; fiscal 2021 aircraft procurement (Navy) funds in the amount of $24,107,860; and non-U.S. DOD participant funds in the amount of $49,254,099 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.