Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $265,590,400 modification (P00023) cost-plus-fixed-fee, firm-fixed-price order (N0001920F0571) against a previously issued basic ordering agreement (N0001919G0008). This modification exercises options and adds scope to increase Block 4 manufacturing capacity and procure material modification kits and special test/tooling equipment that remove life limits, correct deficiencies, and retrofit aircraft with Technical Refresh 3. These retrofit and modification efforts on F-35 aircraft will be across the U.S. Air Force, U.S. Marine Corps, U.S. Navy, non-U.S. Department of Defense (DoD) participants and Foreign Military Sales (FMS) customers. Work will be performed in Fort Worth, Texas and is expected to be completed in September 2028. Fiscal 2022 aircraft procurement (Air Force) funds in the amount of $89,339,876, fiscal 2022 aircraft procurement (Navy) funds in the amount of $72,265,565, fiscal 2021 aircraft procurement (Navy) funds in the amount of $7,188,171, fiscal 2021 aircraft procurement (Air Force) funds in the amount of $3,667,746, fiscal 2020 aircraft procurement (Air Force) funds in the amount of $33,046,071, FMS customer funds in the amount of $6,597,436, and non-U.S. DoD participant funds in the amount of $53,485,535 will be obligated at the time of award, $33,046,071 of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.