The 2013 PPD 21 Presidential Policy Directive of Barack Obama provides us with a list of critical infrastructures to be protected, identifying 16 sectors, in addition to defining the roles, responsibilities, and skills:
- Chemical: Sector-Specific -> Agency: Department of Homeland Security Master in Cyber
- Commercial Facilities: Sector-Specific Agency: Department of Homeland Security
- Communications: Sector-Specific Agency: Department of Homeland Security
- Critical Manufacturing: Sector-Specific Agency: Department of Homeland Security
- Dams: Sector-Specific Agency: Department of Homeland Security
- Defense Industrial Base: Sector-Specific Agency: Department of Defense
- Emergency Services: Sector-Specific Agency: Department of Homeland Security
- Energy: Sector-Specific Agency: Department of Energy
- Financial Services: Sector-Specific Agency: Department of the Treasury
- Food and Agriculture: Co-Sector-Specific Agencies: U.S. Department of Agriculture and Department of Health and Human Services
- Government Facilities: Co-Sector-Specific Agencies: Department of Homeland Security and General Services Administration
- Healthcare and Public Health: Sector-Specific Agency: Department of Health and Human Services
- Information Technology: Sector-Specific Agency: Department of Homeland Security
- Nuclear Reactors, Materials, and Waste: Sector-Specific Agency: Department of Homeland Security
- Transportation Systems: Co-Sector-Specific Agencies: Department of Homeland Security and Department of Transportation
- Water and Wastewater Systems: Sector-Specific Agency: Environmental Protection Agency