Columbia subject headings:
National security--United States.
Risk management--United States.
Terrorism--Risk assessment--United States.
Terrorism--United States--Prevention.
United States. Dept. of Homeland Security--Rules and practice.
Harvard subject headings:
National security--United States
Risk management--United States.
Terrorism--Risk assessment--United States.
Terrorism--United States--Prevention
United States. Department of Homeland Security--Rules and practice.
Princeton subject headings:
National security--United States.
Risk management--United States.
Terrorism--Risk assessment--United States.
Terrorism--United States--Prevention.
United States. Department of Homeland Security--Rules and practice.