BAE Systems Technology Solutions & Services Inc., Rockville, Maryland, is awarded a $51,027,792 cost-plus-fixed-fee contract modification (P00028) to a previously awarded and announced contract (N00030-22-C-6001) to provide support services for the Trident II D5 Strategic Weapon Systems program, Attack Weapon System program, and the Nuclear Weapon Security program. Tasks to be performed include systems engineering and integration, test engineering, data analysis, and safety engineering support services. This contract modification also benefits a foreign military sale to the United Kingdom. Work will be performed in Rockville, Maryland (48.9%); Washington, D.C. (18.3%); Cape Canaveral, Florida (5.2%); Frederick, Maryland (4.8%); Silverdale, Washington (3.6%); Saint Marys, Georgia (2.7%); King’s Bay, Georgia (2.4%); York, Pennsylvania (1.8%); Fort Walton Beach, Florida (1.6%); Rochester, United Kingdom (1.2%); Conway, South Carolina (1.0%); and various other locations (less than 1% each, 8.5% total). Work is expected to be completed Sept. 30, 2025. While this action is an option exercise, no funding will be obligated at this time. This action is being awarded subject to the availability of funds and no funds will expire at the end of the current fiscal year. This contract was originally awarded as a sole source acquisition pursuant to 10 U.S. Code 2304(c)(1)(4). Strategic Systems Programs, Washington, D.C., is the contracting activity.