A person employed as an officer or crew member on a ship who would otherwise be covered under the laws of both the United States and Denmark is covered only under the laws of the country whose flag the ship flies. A ship is considered to fly the flag of the United States if it is an American vessel.

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  RS 01901.150, Employment on American Vessels and American Aircraft

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  RS 01901.170, Employment on Foreign Vessels or Foreign Aircraft

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  RS 01901.450, Coverage under International Totalization Agreements