Security
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Security is protection from, or resilience against, potential harm. Beneficiaries of security may be persons and social groups, objects and institutions, ecosystems, or any other entity or phenomenon vulnerable to unwanted change.
Women's Army Corps (1941–1945) associated national security with avoiding conversations about war work.
Refugees fleeing war and insecurity in Iraq and Syria arrive at Lesbos Island, supported by Spanish volunteers, 2015
Security checkpoint at the entrance to the Delta Air Lines corporate headquarters in Atlanta
X-ray machines and metal detectors are used to control what is allowed to pass through an airport security perimeter.
Security agency
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A security agency is a governmental organization that conducts intelligence activities for the internal security of a nation. They are the domestic cousins of foreign intelligence agencies, and typically conduct counterintelligence to thwart other countries' foreign intelligence efforts.
The headquarters of the Finnish Security Intelligence Service or SUPO in Punavuori, Helsinki
Estonian KAPO headquarters in Kassisaba, Kesklinn, Tallinn