HTS heading 9805

The personal and household effects (with such limitation on the importation of alcoholic beverages and tobacco products as the Secretary of the Treasury may prescribe) of any person in the service of the United States who returns to the United States upon the termination of assignment to extended duty (as defined in regulations issued in connection with this provision) at a post or station outside the customs territory of the United States, or of returning members of his family who have resided with him at such post or station, or of any person evacuated to the United States under Government orders or instructions — 1 code under this heading, with the duty on each.

Source: Harmonized Tariff Schedule of the United States, U.S. International Trade Commission (public domain). Classification and the duties that finally apply to a shipment are a licensed customs broker's call.