it was also a time when many people acted above and beyond the ordinary. reporter: the tributes continued throughout the morning with the nation pausing five more times. the moment each tag win tower f, the moment the pentagon was attacked. it truly an honor to be with all of you at this field of honor. reporter: along with vice president kamala harris, president george w. bush who served as commander in chief in 2001 led a memorial at the site. the 33 passengers and seven crew of flight 93 could have been any group of citizens selected by fate. in a sense, they stood in for us all. the terrorists soon discovered that a random group of americans is an exceptional group of people. reporter: at the pentagon, general mark milley, chairman of the joint chiefs, honored the victims of the attack and service members who died at the subject war in afghanistan. never forget those who were