Columbia subject headings:
National security--United States.
Syria--Foreign relations--United States.
Terrorism--Government policy--Syria.
United States--Foreign relations--Syria.
Weapons of mass destruction--Syria.
Harvard subject headings:
National security--United States
Syria--Foreign relations--United States.
Terrorism--Government policy--Syria.
United States--Foreign relations--Syria.
Weapons of mass destruction--Syria.
Princeton subject headings:
National security--United States.
Syria--Foreign relations--United States.
Terrorism--Government policy--Syria.
United States--Foreign relations--Syria.
Weapons of mass destruction--Syria.