Lockheed Martin Rotary and Mission Systems, Manassas, Virginia, is awarded a $17,865,579 cost-plus-fixed-fee modification to a previously awarded contract (N00024-19-C-6400) for systems engineering and integration on Navy submarines. Work will be performed in Manassas, Virginia (68%); Waterford, Connecticut (10%); Groton, Connecticut (10%); Middletown, Rhode Island (7%); and Newport, Rhode Island (5%), and is expected to be completed by September 2024. Fiscal 2024 research, development, test and evaluation (Navy) funds in the amount of $6,088,545 (61%); fiscal 2022 shipbuilding and conversion (Navy) funds in the amount of $2,202,556 (22%); and fiscal 2018 shipbuilding and conversion (Navy) funds in the amount of $1,631,339 (17%), 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.