DHS / CISA identifies how many critical infrastructure sectors whose protection is prioritized for national security?
Explanation
CISA designates 16 critical infrastructure sectors under Presidential Policy Directive 21 (PPD-21): Chemical; Commercial Facilities; Communications; Critical Manufacturing; Dams; Defense Industrial Base; Emergency Services; Energy; Financial Services; Food and Agriculture; Government Facilities; Healthcare and Public Health; Information Technology; Nuclear Reactors/Materials/Waste; Transportation Systems; Water and Wastewater Systems. Each sector has a Sector Risk Management Agency. Private security guards frequently work in commercial facilities, healthcare, and transportation sectors, which makes their awareness directly relevant to homeland security.
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