General Dynamics Mission Systems, Fairfax, Virginia, is awarded a $15,904,492 cost-plus-fixed-fee and cost-only modification to previously awarded contract N00024-19-C6407 to exercise options for engineering services in support of AN/BYG-1 Tactical Control System design, integration, and testing. Work will be performed in Fairfax, Virginia, and is expected to be completed by July 2023. Fiscal 2022 research, development, test and evaluation in the amount of $5,225,425 (94%); Royal Australian Navy funds in the amount of $304,290 (5%); and fiscal 2021 other procurement (Navy) funding in the amount of $20,095 (1%) will be obligated at time of award and will not expire at the end of the current fiscal year. Royal Australian Navy funding provided in accordance with the Armament Cooperative Program. The Naval Sea Systems Command, Washington, D.C., is the contracting activity.