Book excerpt: This textbook introduces students to the critical role of the US intelligence community within the wider national security decision-making and political process. Intelligence in the National Security Enterprise defines what intelligence is and what intelligence agencies do, but the emphasis is on showing how intelligence serves the policymaker. Roger Z. George draws on his thirty-year CIA career and more than a decade of teaching at both the undergraduate and graduate level to reveal the real world of intelligence. Intelligence support is examined from a variety of perspectives to include providing strategic intelligence, warning, daily tactical support to policy actions as well as covert action. The book includes useful features for students and instructors such as excerpts and links to primary-source documents, suggestions for further reading, and a glossary.