Understanding Homeland Security

Welcome to the SAGE edge site for Understanding Homeland Security, 3rd edition.

The SAGE edge site for Understanding Homeland Security by Gus Martin offers a robust online environment you can access anytime, anywhere, and features an impressive array of free tools and resources to keep you on the cutting edge of your learning experience.

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Gus Martin’s Understanding Homeland Security provides students with a comprehensive introduction to U.S. homeland security in the modern world, with a focus on the post-September 11, 2001 era. This insightful resource examines the theories, agency missions, laws, and regulations governing the homeland security enterprise through the lens of threat scenarios and countermeasures related to terrorism, natural disasters, emergency management, cyber security, and much more. The Third Edition keeps readers on the forefront of homeland security with coverage of cutting-edge topics, such as the role of FEMA and preparedness planning; the role of civil liberty and countering extremism through reform; and hackings during the 2016 and 2018 U.S. elections. Readers will gain much-needed insight into the complex nature of issues surrounding today’s homeland security and learn to think critically to analyze and respond to various threat environments.


We gratefully acknowledge Gus Martin for writing an excellent text and creating the materials on this site. Special thanks are also due to Heidi Getchell-Bastien of Massachusetts Bay Community College and Alicia Fisher of California State University Fullerton for developing the assessment for this site.