Columbia subject headings:
Customs administration--United States.
National security--United States.
U.S. Customs and Border Protection.
U.S. Immigration and Customs Enforcement.
United States--Emigration and immigration--Government policy.
United States. Dept. of Homeland Security--Management.
Harvard subject headings:
Customs administration--United States.
National security--United States
U.S. Customs and Border Protection.
U.S. Immigration and Customs Enforcement.
United States--Emigration and immigration--Government policy.
United States. Department of Homeland Security--Management.
Princeton subject headings:
Customs administration--United States.
National security--United States.
U.S. Customs and Border Protection.
U.S. Immigration and Customs Enforcement.
United States--Emigration and immigration--Government policy.
United States. Department of Homeland Security--Management.