Citizens are the remainder of Earth's human population, after the Seven Hour War and subsequent Combine occupation. The term citizen, depending on context, usually refers to a human living under the Combine's rule in a city, as opposed to a rebel or refugee. Having conquered the Earth, the Combine established their rule on Earth, creating Overwatch Soldiers from human soldiers captured during the Seven Hour War. The remaining population was rounded up into the surviving cities, which were redesignated with numbers instead of names. read more...