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 Amy Zegart, author and co-director of the Center for International Security and Cooperation at Stanford University.