Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a not-to-exceed $100,000,000 cost-plus-fixed-fee modification (P00002) to a previously awarded contract (N0001923C0009). This modification exercises an option to procure software licenses, prototypes, digital twins, and associated test hardware required to support F-35 Block Four early capability development for the Air Force, Navy, Marine Corps, and non-Department of Defense (DOD) participants. Work will be performed in Fort Worth, Texas (60%); Nashua, New Hampshire (16%); Baltimore, Maryland (9%); Orlando, Florida (5.5%); El Segundo, California (2%); San Diego, California (2%); Torrance, California (2%); Buffalo, New York (1%); Clearwater, Florida (1%); Northridge, California (1%); and Tucson, Arizona (0.5%), and is expected to be completed in March 2026. Fiscal 2023 research, development, test and evaluation (Air Force) funds in the amount of $3,687,689; fiscal 2023 research, development, test and evaluation (Navy) funds in the amount of $3,687,688; and non-DOD participant funds in the amount of $1,624,623 will be obligated at the time of award, none of which will expire at the end of the current fiscal year. Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.