Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a not-to-exceed $606,800,000 fixed-price incentive (firm-target) undefinitized modification (P00002) to a previously awarded advanced acquisition contract (N0001923C0003). This modification procures long lead time materials, parts, components, and efforts in support of maintaining on-time production and delivery of 173, Lot 19, F-35 Joint Strike Fighter aircraft for Foreign Military Sales (FMS) customers and non-U.S. Department of Defense (DOD) participants. Work will be performed in Fort Worth, Texas (59%); El Segundo, California (14%); Warton, United Kingdom (9%); Cameri, Italy (4%); Orlando, Florida (4%); Nashua, New Hampshire (3%); Baltimore, Maryland (3%); San Diego, California (2%); and various locations outside the continental U.S. (2%), and is expected to be completed in January 2028. FMS customer funds in the amount of $329,500,000; and non-U.S. DOD Participants Funds in the amount of $277,300,000, will be obligated at 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.