U.S. Customs: Defending AmericaWith the attack on the World Trade Center on September 11, 2001, America has vastly changed its methods of defense of its borders. This program, from Defending America, examines how U.S. Customs workers are trained, what weapons they use, and how they responded to the 9/11 terrorist attacks. Now on the forefront of homeland security, this agency is prepared to thwart future attacks.