1. Homeland Security Comes of Age. . . 1
2. Building a Better Enterprise . . . 23
3. Organizing Homeland Security: The Challenge of Integration at DHS . . . 41
4. DHS and the Counterterrorism Enterprise. . . 57
5. Rethinking Borders: Securing the Flows of Travel and Commerce in the Twenty-First Century . . . 77
6. The Trusted and the Targeted: Segmenting Flows by Risk. . . 101
7. The Challenge of Securing the Global Supply System. . . 121
8. Rethinking Transportation Security. . . 147
9. Fragmentation in Unity: Immigration and Border Policy within DHS. . . 169
10. Emergency Management and DHS. . . 191
11. Protecting Critical Infrastructure. . . 203
12. Cybersecurity . . .225
13. Increasing Security while Protecting Privacy. . . 247
14. Homeland Security and Transnational Crime. . . . 267
15. The Future of Homeland Security . . . 285
Abbreviations. . .309
Notes. . . 313
Index . . . 361
Contributors . . . 377
About the Belfer Center Studies in International Security. . . . . . 385
About the Belfer Center for Science and International Affairs. . . . 389