- Citizen of the United States;
- Lawful permanent resident, i.e., a person lawfully accorded the privilege of residing permanently in the United States as an immigrant in accordance with the immigration laws;
- Person who is a protected individual, e.g., a person admitted as a refugee or granted asylum; or
- Corporation, business association, partnership, society, trust, or any other entity, organization or group that is incorporated to do business in the United States, and any governmental (federal, state, or local) entity in the United States.
Note: This differs from the definition used in the "Foreign Visits and Assignments" process, which considers anyone not actually a US citizen to be a foreign national.