Columbia subject headings:
Risk management--United States.
Terrorism--United States--Prevention.
United States. Dept. of Homeland Security--Management.
Harvard subject headings:
Risk management--United States.
Terrorism--United States--Prevention
United States. Department of Homeland Security--Management.
Princeton subject headings:
Risk management--United States.
Terrorism--United States--Prevention.
United States. Department of Homeland Security--Management.