Columbia subject headings:
Diplomatic and consular service, American--Buildings--Security measures.
Public buildings--Security measures--United States.
United States. Department of State--Security measures.
Harvard subject headings:
Diplomatic and consular service, American--Buildings--Security measures.
Public buildings--United States--Security measures.
United States. Department of State--Security measures.
Princeton subject headings:
Diplomatic and consular service, American--Buildings--Security measures.
Public buildings--United States--Security measures.
United States. Department of State--Security measures.