18 years later, America vows to 'never forget' 9/11

A woman pays respects at the Wall of Names at the Flight 93 National Memorial in Shanksville, Pa. after a Service of Remembrance Wednesday, Sept. 11, 2019, as the nation marks the 18th anniversary of the Sept. 11, 2001 attacks. The Wall of Names honor the 40 people killed in the crash of Flight 93.