Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $21,482,967 modification (P00016) to a cost-plus-fixed-fee order (N0001920F0571) against a previously issued basic ordering agreement (N0001919G0008). This modification increases the scope for nine engineering change proposals comprised of material kits and special test/tooling equipment necessary to support retrofit and modification efforts on F-35 Joint Strike Fighter aircraft for the Air Force, Navy, Marine Corps, non-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 February 2026. Fiscal 2021 aircraft procurement (Navy) funds in the amount of $1,532,654; fiscal 2020 aircraft procurement (Air Force) funds in the amount of $12,015,883; non-DoD participants funds in the amount of $4,872,175; and FMS funds in the amount of $3,062,255 will be obligated on this 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.