Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a not-to-exceed $170,000,000 undefinitized cost-plus-fixed-fee order (N0001923F0157) against a previously issued basic ordering agreement (N0001919G0008). This order provides non-recurring engineering for flight test instrumentation modifications to four production aircraft (BF-139, AF-413, CF-95, and CF-110) in support of the Joint Strike Fighter Program’s Tech Refresh 3 and Block 4 weapons testing objectives and ship suitability testing for the Air Force, Marine Corps, Navy, and non-U.S. Department of Defense (DOD) program participants. Work will be performed in Fort Worth, Texas (30%); El Segundo, California (25%); Warton, United Kingdom (20%); Orlando, Florida (10%); Nashua, New Hampshire (5%); Nagoya, Japan (5%); and Baltimore, Maryland (5%), and is expected to be completed in July 2026. Fiscal 2023 research, development, test and evaluation (Air Force) funds in the amount of $6,864,218; fiscal 2023 research, development, test and evaluation (Navy) funds in the amount of $6,864,218; and non-U.S. DOD participant funds in the amount of $3,024,056 will be obligated at the 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.