“This study by Mr. Sean Kalic, of the Department of Military History, US Army Command and General Staff College, examines modern transnational terrorism from the 1960s to the present day, with special emphasis on the adaptation Al Qaeda and other non-state actors have taken in response to the actions of the United States and its allies. This work provides a cautionary warning about the likelihood Al Qaeda will continue to survive and execute missions in the current operating environment. […] As the US Army continues its efforts in combating terrorists, the thoughts found in this narrative are well worth considering.”—THOMAS T. SMITH, Director, Combat Studies Institute