The Cyberspace Solarium Commission (CSC) was a United States bipartisan, congressionally mandated intergovernmental body created by the John S. McCain National Defense Authorization Act for Fiscal Year 2019. Its purpose was "to develop a strategic approach to defense against cyber attacks of significant consequences" to the United States.[1] The commission was sunsetted on December 21, 2021, but is continuing its work as a non-profit in 2022, led by Mark Montgomery, the commission's former executive director at the non-profit organization Foundation for the Defense of Democracies (FDD) with a limited staff and the support of a small number of senior advisors.[2][3] Known as CSC 2.0, this project preserves the legacy and continues the work of the CSC.[4]