In the ideological zeal and tenacity of ISIS, the U.S hasn't seen such a determined enemy since Hitler's Germany or Imperial Japan, says a national security policy expert at Texas A&M University. Professor Jasen Castillo examines this growing terrorist threat, as well as other potential dangers from the Middle East and countries such as Russia and North Korea, through the lens of his "cohesion theory," a framework he developed in hopes of helping analysts and strategists gauge the staying power of military forces.

Learn more about Castillo's cohesion theory and how he applies it to different militaries of the past.



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