Terror has plagued the world since men in caves flailed away at each other with sticks and stones. Today, international terrorism has become a form of warfare. The U.S. Department of Defense defines terrorism as the unlawful use ofor threatened use offorce or violence against individuals or property to coerce or intimidate governments or societies. The American way of life changed forever when 19 Islamic terrorists flew fuel-laden aircraftflying bombsinto the World Trade Center in New York City and the Pentagon in Washington, DC, on September 11, 2001.