Columbia subject headings:
National security--Economic aspects--United States.
National security--United States--Planning.
United States--Defenses--Economic aspects.
United States--Defenses--Planning.
United States--Economic policy--2001-2009.
United States--Foreign relations administration--Economic aspects.
Harvard subject headings:
Princeton subject headings:
Civil defense--United States--Cost effectiveness.
National security--United States--Cost effectiveness.
Natural disasters--United States.
Public administration--United States--Cost effectiveness.
Terrorism--United States--Prevention--Cost effectiveness.