Eighteen years later, they remain gone – but never forgotten.
Morning ceremonies were held Wednesday at Ground Zero, the Pentagon, and at the Flight 93 National Memorial near Shanksville, Pa. And this year is the first time the names of each are being read in the presence of a new, bittersweet section of the 9/11 Memorial -- one honoring the growing list of first responders who've passed away from illnesses diagnosed in the aftermath of the attacks.
