The Charles Stark Draper Laboratory, Cambridge, Massachusetts, is awarded a $20,000,000 modification (P00013) to a previously awarded cost-plus-fixed-fee contract (N00030-20-C-0004) to provide guidance, navigation, and control (GN&C) subject-matter expertise and resources to explore and evaluate current maturing concepts and technologies to enable follow-on, full-scale development of strategic guidance, navigation, and control (SGN&C) solutions for the second life extension of the TRIDENT II Strategic Weapon System. This contract also provides research and development into new and alternate GN&C technologies and concepts to support alternate and developing strategic systems programs missions. Work will be performed in Cambridge, Massachusetts, with an expected completion date of Sept. 30, 2021. The modification will be incrementally funded with fiscal 2021 research, development, test and evaluation (Navy) funds in the amount of $5,792,117. No funds will expire at the end of the current fiscal year. This contract was a sole-source acquisition pursuant to 10 U.S. Code 2304(c)(1). Strategic Systems Programs, Washington, D.C., is the contracting activity.