The U.S. Department of State and the U.S. Department of Homeland Security’s (DHS) Cybersecurity and Infrastructure Security Agency (CISA) developed this guide to serve as an overview of the U.S. all-hazards approach to critical infrastructure security and resilience. It is intended for both domestic and international partners.
https://www.cisa.gov/sites/default/files/publications/Guide-Critical-Infrastructure-Security-Resilience-110819-508v2.pdf