First responders worldwide risk their lives so others may live. Structural steel from the Twin Towers, items from the Flight 93 crash site in Shanksville, Pa, and artifacts from the Pentagon come from places attacked on September 11, 2001, and these remnants are reminders of America's unbreakable spirit. Since 1776 the United State has stood Twin Towers tall, and its tribute in light at Ground Zero will always serve as a beacon for freedom-loving people everywhere.