Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, was awarded a $41,646,305 cost-plus-fixed-fee order (N0001925F0137) against a previously issued basic ordering agreement (N0001924G0010). This order procures engineering, integration support, hardware, and installation support for flight test instrumentation modifications to F-35 production aircraft. This flight test instrumentation will support test and evaluation flight tests. Work will be performed in Fort Worth, Texas (81%); Orlando, Florida (7%); Linthicum, Maryland (3%); Nashua, New Hampshire (3%); San Diego, California (2%); El Segundo, California (2%); Samlesbury, United Kingdom (1%); and other various locations within and outside of the continental U.S. (1%), and will be completed in March 2028. Fiscal 2025 research, development, test, and evaluation (Air Force) funds in the amount of $1,850,000; fiscal 2025 research, development, test, and evaluation (Navy) funds in the amount of $925,000; fiscal 2025 research, development, test and evaluation (Marine Corps) funds in the amount of $925,000; and non-U.S. Department of Defense F-35 Cooperative Program Partners funds in the amount of $3,559,793, will be obligated at the time of award, none of which will expire at the end of the current fiscal year. This contract was not competed. Naval Air Systems Command, Patuxent River, Maryland is the contracting activity.