Columbia subject headings:
National security--United States--History--20th century.
National security--United States--History--21st century.
Nuclear weapons--United States--History.
United States--Politics and government--20th century.
United States--Politics and government--21st century.
Harvard subject headings:
National security--United States
Nuclear weapons--United States
United States--Politics and government
Princeton subject headings:
National security--United States.
Nuclear weapons--United States.
United States--Politics and government.