Northrop Grumman Systems Corp., Marine Systems (NGSC-MS), Sunnyvale, California, is being awarded a $42,364,171 cost-plus-incentive-fee and cost-plus-fixed-fee contract (N0003025C1010) to provide ongoing support of the Trident II (D-5) deployed ballistic missile submarines and the guided missile submarines (SSGN) underwater launcher systems (ULS). NGSC-MS will provide technical engineering support and integration for D-5 and the SSGN attack weapon system. This support includes field services at sites and shipyards. The contract also has optional line items for continued support in the total amount of $318,716,528. This contract award also benefits a Foreign Military Sale. Work will be performed in Sunnyvale, California (51%); Bangor, Washington (18%); Kings Bay, Georgia (15%); Cape Canaveral, Florida (10%); Rocket Center, West Virginia (5%); and Annapolis, Maryland (1%). Work is expected to be completed by Sept. 30, 2031. Fiscal 2025 operations and maintenance (Navy) funds in the amount of $10,179,650 will be obligated at time of award and will expire at the end of the current fiscal year; and fiscal 2024 research development test and evaluation (Navy) funds in the amount of $7,716,758 will be obligated at time of award and will expire at the end of the current fiscal year. This contract is being awarded as a sole-source acquisition pursuant to 10 U.S. Code 3204(a)(1) and was previously synopsized on the System for Award Management (SAM.gov) online portal. Strategic Systems Programs, Washington, D.C., is the contracting activity.