Marinette Marine Corp., Marinette, Wisconsin, is awarded a $39,414,122 cost-plus-fixed-fee modification to previously awarded contract N00024-20-C-2300 to exercise an option for fiscal 2022 engineering and class support requirements in support of detail design and construction of the Constellation-class guided-missile frigate. Work will be performed in Marinette, Wisconsin (30%); Newport News, Virginia (25%); New York, New York (10%); Columbia, Maryland (10%); Philadelphia, Pennsylvania (10%); Ayer, Massachusetts (5%); Arlington, Virginia (5%); Herndon, Virginia (2%); Camden, New Jersey (2%); and Tulsa, Oklahoma (1%), and is expected to be completed by August 2023. Work is expected to be completed by August 2031 if all options are exercised. Fiscal 2022 shipbuilding and conversion (Navy) funds in the amount of $5,500,000 will be obligated at time of award and will not expire at the end of the current fiscal year. The Naval Sea Systems Command, Washington, D.C., is the contracting activity.