General Dynamics Electric Boat Corp., Groton, Connecticut, is awarded a $532,921,125 cost-plus-fixed-fee modification to previously awarded contract (N00024-20-C-2120) for Lead Yard Support and Development Studies and Design efforts related to Virginia-class submarines. This contract modification includes options which, if exercised, would bring the cumulative value of the modification to $813,720,300. Work will be performed in Groton, Connecticut (99%) and Newport News, Virginia (1%), and is expected to be completed by October 2023. Fiscal 2022 research, development, test, and evaluation (Navy) $96,759,178 (89%); fiscal 2022 shipbuilding and conversion (Navy) $8,449,061 (7%); fiscal 2019 shipbuilding and conversion (Navy) $2,001,990 (2%); fiscal 2020 shipbuilding and conversion (Navy) $1,223,913 (1%); fiscal 2017 shipbuilding and conversion (Navy) $720,000 (1%); and fiscal 2021 shipbuilding and conversion (Navy) $70,000 (1%), will be obligated at time of award, of which, $96,759,178 will expire at the end of the current fiscal year. The Naval Sea Systems Command, Washington, District of Columbia, is the contracting activity.