Huntington Ingalls Inc., Pascagoula, Mississippi, is awarded a $2,414,000,000 detail, design, and construction modification to previously awarded contract N00024-20-C-2437 in support of one Amphibious Assault Ship (General Purpose) Replacement (LHA(R)) Flight 1 Ship (LHA 9). Work will be performed in Pascagoula, Mississippi (72%); Milwaukee, Wisconsin (2%); Baltimore, Maryland (2%); Beloit, Wisconsin (2%); Brunswick, Georgia (2%); Philadelphia, Pennsylvania (1%); Cincinnati, Ohio (1%); Kingsford, Michigan (1%); Hueytown, Alabama (1%); York, Pennsylvania (1%); Cranberry Township, Pennsylvania (1%); and others individually less than 1% each (14%). Work is expected to be completed by September 2029. Fiscal 2021 shipbuilding and conversion (Navy) funds in the amount of $93,000,001 will be obligated at time of award and will not expire at the end of the current fiscal year. This contract includes options, which, if exercised, would bring the cumulative value of this contract to $3,190,605,290. If all options are exercised, work will continue through March 2031. This sole source contract modification was not competitively procured in accordance with 10 U.S. Code 3204(c)(1), as implemented by Defense Federal Acquisition Regulation 6.302-1 – only one responsible source. The Naval Sea Systems Command, Washington, D.C., is the contracting activity.