The first operational deployment of the system occurred during the buildup for the Persian Gulf War . With the success of this deployment , the U.S. Army signed an additional contract for another 679 vehicles , bringing the total order to 1,004 units . The Avenger was again successfully deployed in support of NATO operations during the Bosnian War . The Avenger system received widespread public exposure when it was placed around the Pentagon during the first anniversary of the September 11 attacks of 2001 . The Avenger was also deployed during the U.S. military 's operations in Afghanistan and Iraq
September 11 attacks
September 11 attacks
AN/TWQ-1 Avenger