Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a not-to-exceed $49,175,235 undefinitized cost reimbursable order (N00019-21-F-0836) against previously issued basic ordering agreement N00019-19-G-0008. This order provides engineering support to address deficiencies for production and modifications of F-35 Joint Strike Fighter aircraft and delivery of associated technical data for the Navy, Marine Corps and the Air Force. Work will be performed in Fort Worth, Texas, and is expected to be completed in March 2024. Fiscal 2021 aircraft procurement (Air Force) funds in the amount $4,901,961; fiscal 2019 aircraft procurement (Navy) funds in the amount of $17,195,771; and fiscal 2019 aircraft procurement funds (Air Force) in the amount of $2,489,885, will be obligated at the time of award, $19,685,656 of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity. (Awarded June 18, 2021)