Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $324,141,425 modification (P00020) to a cost-plus-fixed-fee, firm-fixed-price order (N0001920F0571) against a previously issued basic ordering agreement (N0001919G0008). This modification exercises options to support calendar year 2022 modification and retrofit activities for the F-35 Joint Strike Fighter program to include the procurement of material modification kits as well as program management, non-recurring engineering, aircraft induction, contractor field, depot site and laser shock peening site support. Additionally, this modification adds scope for the procurement of material kits as well as special tooling and test equipment necessary to support F-35 Joint Strike Fighter aircraft retrofit and modification efforts for the Air Force, Navy, Marine Corps, non-U.S. Department of Defense (DOD) participants and Foreign Military Sales (FMS) customers from the governments of Israel, Japan and the Republic of Korea. Work will be performed in Fort Worth, Texas (74.8%); Nagoya, Japan (8.3%); Cameri, Italy (7.2%); Williamtown, Australia (3.5%); Cherry Point, North Carolina (3.3%); and Ogden, Utah (2.9%); and is expected to be completed in in January 2027. Fiscal 2022 aircraft procurement (Air Force) funds in the amount of $73,608,286; fiscal 2022 aircraft procurement (Navy) funds in the amount of $61,458,715; fiscal 2021 aircraft procurement (Air Force) funds in the amount of $56,367,878; fiscal 2021 aircraft procurement (Navy) funds in the amount of $20,030,656; non-U.S. DOD participant funds in the amount of $65,798,505; and FMS funds in the amount of $46,877,385 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.