Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $10,157,493 cost-plus-fixed-fee, firm-fixed-price modification (P00021) to an order (N0001920F0571) against a previously issued basic ordering agreement (N0001919G0008). This modification adds scope and exercises options to procure various material modification kits and special test/tooling equipment necessary to support various modifications and retrofit efforts on F-35 aircraft for the Air Force, Navy, Marine Corps, 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 October 2024. Fiscal 2022 aircraft procurement (Navy) funds in the amount of $87,858; fiscal 2021 aircraft procurement (Navy) funds in the amount of $2,743,810; fiscal 2021 aircraft procurement (Air Force) funds in the amount of $2,518,940; fiscal 2020 aircraft procurement (Air Force) funds in the amount of $45,785; non-U.S. DOD participant funds in the amount of $4,082,549; and FMS funds in the amount of $678,551 will be obligated at the time of award, $45,785 of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.