This is a list of militaries that recruit foreign applicants. This includes any individuals who are aliens of the polity whose armed forces they are being recruited to join by professional recruiters. The foreigners do not need to be legal residents of that nation, but may gain legal residence status by joining the armed forces. More than 90 states have implemented such recruitment policies between 1815 and 2020.

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Recognizing this situation, Greece grants citizenship to broad categories of people of ethnic Greek ancestry who are members of the Greek diaspora, including individuals and families whose ancestors have been resident in diaspora communities outside the modern state of Greece for centuries or millennia. "Foreign persons of Greek origin", who neither live in Greece nor hold Greek citizenship nor were necessarily born there, may become Greek citizens by enlisting in Greece's military forces, under article 4 of the Code of Greek Citizenship, as amended by the Acquisition of Greek Nationality by Aliens of Greek Origin Law (Law 2130/1993). Anyone wishing to do so must present a number of documents, including "[a]vailable written records ... proving the Greek origin of the interested person and his ancestors".

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