United States
CIA chief Brennan's hidden role
New CIA chief John Brennan, Barack Obama's former anti-terrorism advisor, was the architect of US policy in Yemen.
The Central Intelligence Agency (CIA) was the successor to the Office of Strategic Services (OSS) after the Second World War. Its heyday was during the Cold War. CIA considers itself as the senior intelligence service among the US Intelligence Community. Before the establishment of the Defense Clandestine Service (DCS), it was the only agency able to carry out clandestine operations, through its National Clandestine Service (NCS).