Marinette Marine Corp., Marinette, Wisconsin, is awarded a $1,044,529,113 fixed-price incentive (firm-target) modification to previously awarded contract (N00024-20-C-2300) to exercise options for detail design and construction of two Constellation-class guided-missile frigates, FFG 66 and FFG 67. Work will be performed in Marinette, Wisconsin (51%); Camden, New Jersey (17%); Chicago, Illinois (7%); Green Bay, Wisconsin (4%); Pittsburgh, Pennsylvania (3%); Hauppauge, New York (3%); Sturgeon Bay, Wisconsin (3%); Cincinnati, Ohio (3%); Kaukauna, Wisconsin (2%); Charlotte, North Carolina (2%); Bethesda, Maryland (2%); Millersville, Maryland (2%); and Atlanta, Georgia (1%), and is expected to be completed by April 2030. Fiscal 2024 shipbuilding and conversion (Navy) funds in the amount of $1,044,529,113 will be obligated at time of award and will not expire at the end of the current fiscal year. Naval Sea Systems Command, Washington, D.C., is the contracting activity.