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Staffed by unmodified humans, as opposed to the transhuman Overwatch, Civil Protection acts as the Combine's police force and handles the affairs of policing and monitoring the populace in the cities. The Combine also established the Civil Protection force.
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The Combine also erected a Suppression Field, to prevent procreation. These new "Citizens" of the Combine's empire are provided with accommodation, rations and protection from the Xen aliens that infest much of the world.
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The remaining population was rounded up into the still-standing cities, which were re-designated with numbers instead of names ( 14, 17, etc.).
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After a successful invasion, the Combine began to establish their dictatorship over the Earth, creating Overwatch Soldiers from human soldiers captured during the Seven Hour War.
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