Columbia subject headings:
Terrorism--Africa, Northeast.
Terrorism--Yemen (Republic)
Harvard subject headings:
Terrorism--Africa, Northeast.
Terrorism--Yemen.
Princeton subject headings:
Africa, Eastern--Foreign relations--United States--Congresses.
Africa, Eastern--Politics and government--1960---Congresses.
Terrorism--Africa, Eastern--Congresses.
United States--Foreign relations--Africa, Eastern--Congresses.