Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $489,464,143 modification (P00002) to a cost-plus-fixed-fee, firm-fixed-price order (N0001923F0002) against a previously issued basic ordering agreement (N0001919G0008). This modification adds scope to procure various material mod kits, special test/tooling equipment, as well as provides product engineering, and installation in support of retrofit and modification engineering change proposal efforts on F-35 aircraft to correct aircraft deficiencies and upgrade F-35 aircraft with Technology Refresh Three for the Air Force, Marine Corps, Navy, Foreign Military Sales (FMS) customers and non-U.S. Department of Defense (DOD) participants. Work will be performed in Fort Worth, Texas, and is expected to be completed in March 2028. Fiscal 2023 aircraft procurement (Air Force) funds in the amount of $195,183,829; fiscal 2023 aircraft procurement (Navy) funds in the amount of $171,871,471; fiscal 2022 aircraft procurement (Air Force) funds in the amount of $963,892; fiscal 2022 aircraft procurement (Navy) funds in the amount of $818,354; fiscal 2021 aircraft procurement (Navy) procurement funds in the amount of $6,792,712; fiscal 2021 aircraft procurement (Air Force) funds in the amount of $12,817,799; fiscal 2021 aircraft procurement (Navy) funds in the amount of $7,459,308; FMS funds in the amount of $33,390,770; and non-U.S. DOD participant funds in the amount of $66,958,720, will be obligated at the time of award, $20,277,107 of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.