Columbia subject headings:
Emergency management--United States--Planning.
National security--United States--Planning.
Terrorism--Prevention--Government policy--United States.
Harvard subject headings:
Emergency management--United States--Planning.
National security--United States--Planning.
Terrorism--Prevention--Government policy--United States
Princeton subject headings:
Emergency management--United States--Planning.
National security--United States--Planning.
Terrorism--Prevention--Government policy--United States.