"Entitlement to cast an external vote is usually linked to the general entitlement to vote that applies to all eligible electors in a country. However, there are sometimes extra requirements imposed on external electors, such as a minimum period of previous residence or an intention to return to the country. In some cases only limited groups of external electors may be eligible to vote, such as diplomats, other public officials and members of the armed forces, and their families."
International IDEA: Voting From Abroad: The International IDEA Handbook, p. 89

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Voting From Abroad: The International IDEA Handbook