Lockheed Martin Space, Littleton, Colorado, is awarded a cost-plus-incentive-fee and cost-plus-fixed-fee unpriced letter contract modification (P00085) with a not-to-exceed amount of $534,000,000 under contract N00030-19-C-0025. This effort will support systems engineering and development and testing for the Conventional Prompt Strike. The modification will also incorporate an optional line item which, if exercised, would increase the value, and not-to-exceed amount, to $570,000,000. Work will be performed in Denver, Colorado (48%); Sunnyvale, California (15%); Cambridge, Massachusetts (11%); Sunnyvale, California (7%); Pittsfield, Massachusetts (6%); Huntsville, Alabama (4%); Magna, Utah (3%); East Aurora, New York (1%); Bristol, Pennsylvania (1%); Simsbury, Connecticut (1%); and various other locations (less than 1.0% each, 3% total. Work under this undefinitized contract is expected to be completed on June 19, 2025. Fiscal 2024 research, development, test and evaluation (Navy) funds in the amount of $115,000,000 will be obligated upon award. No funds will expire at the end of the current fiscal year. This contract is being awarded to the contractor on a sole source basis under 10 U.S. Code 2304(c)(1) and was previously synopsized on the System for Award Management online portal. Strategic Systems Programs, Washington, D.C., is the contracting activity.