Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $1,006,436,959 modification (P00036) to a previously awarded cost-plus-incentive-fee contract (N0001922C0041). This modification extends services to provide continued engineering, maintenance, logistics, manpower, and material support for F-35 Joint Strike Fighter (JSF) laboratory facilities and F-35 developmental flight test activities. Additionally, this modification adds scope for Foreign Military Sales (FMS) test requirements, parts support for supplemental fleet aircraft, electromagnetic environment evaluation testing, ground support equipment recapitalization, ground support for additional aircraft, shared simulation services, increased pacing of resolving software product anomaly reports, cyber infrastructure engineering, and an increased number of pilot maintenance training lab devices in support of the F-35 JSF program for the Air Force, Navy, FMS, and the F-35 cooperative program partners. Work will be performed Fort Worth, Texas (30%); Palmdale, California (26%); Patuxent River, Maryland (23%); Orlando, Florida (11%); San Diego, California (3%); Linthicum, Maryland (2%); Manchester, New Hampshire (2%); Los Angeles, California (1%); Samlesbury, United Kingdom (1%); and various locations within the continental U.S. (1%), and is expected to be completed in March 2027. Fiscal 2024 research, development, test and evaluation (Navy) funds in the amount of $35,407,127; fiscal 2024 research, development, test and evaluation (Air Force) funds in the amount of $34,386,333; fiscal 2024 operations and maintenance (Air Force) funds in the amount of $28,486,158; fiscal 2024 operations and maintenance (Navy) funds in the amount of $14,243,079; fiscal 2024 operations and maintenance (Marine Corps) funds in the amount of $14,243,079; fiscal 2023 research, development, test and evaluation (Navy) funds in the amount of $1,411,306; cooperative program partners funds in the amount of $28,002,424; and FMS funds in the amount of $9,307,965, will be obligated at the time of award, $58,383,622 which will expire at the end of the current fiscal year. Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.