Hostile force or person

Hostile force or person means any nation, any subject of a foreign nation, or any other person serving a foreign nation -
(1) Engaged in a war against the United States or any of its allies;
(2) Engaged in armed conflict, whether or not war has been declared, against the United States or any of its allies; or
(3) Engaged in a war or armed conflict between military forces of any origin in any country in which a person covered by the Act is serving.

Source

20 CFR § 61.4

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Scoping language

For the purpose of this part -

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