Timken Gears & Services Inc., King of Prussia, Pennsylvania, is awarded a $77,331,822 firm-fixed-price modification to previously-awarded contract N0002416C4202 to exercise the option for two fiscal 2021 main reduction gear shipsets to support DDG-51-Class Hulls 136 and 137. Work will be performed in Santa Fe Springs, California (77%); Riverside, Missouri (10%); Latrobe, Pennsylvania (3%); Fitchburg, Massachusetts (3%); Erie, Pennsylvania (3%); New Castle, Delaware (2%); Milwaukee, Wisconsin (1%); and St. Augustine, Florida (1%), and is expected to be completed by March 2024. Fiscal 2021 shipbuilding and conversion (Navy) funding in the amount of $77,331,822 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.