You've heard of the CIA and NSA... how about the NGA? That's the National Geospatial-Intelligence Agency by the way (formerly known as the National Imagery and Mapping Agency) which is just one of the more than a dozen intelligence agencies operating in the United States. So how do all these agencies coordinate? Who is in charge? Today, an intelligent lesson guided by Dr. Amy Zegart, author and co-director of the Center for International Security and Cooperation at Stanford University.