Harry Beiste & Ken Jackson 
Homeland Security After 9/11 [PDF ebook] 

The events of September 11, 2001, led to profound changes in government policies and structures to confront homeland security threats. Most notably, the Department of Homeland Security (DHS) began operations in 2003 with key missions that included preventing terrorist attacks from occurring in the U.S., and minimizing the damages from any attacks that may occur. This book examines DHS’s progress in implementing its homeland security missions since it began operations; work remaining and issues affecting implementation efforts.