He carried the badge with him for the rest of his presidency.
President Trump marked the anniversary of the 9-11 attacks with a speech in Shanksville, Pennsylvania, where Flight 93 went down. It's where hijackers crashed a commercial airliner on september 11, 2001, after the 40 passengers and crew members realized what was happening and tried to storm the cockpit.
It's believed that Flight 93 also was headed for the nation's capital, but its passengers banded together and mounted an attack, forcing the plane to crash in Shanksville, about 20 minutes flying time from its intended destination.
It was his first visit as president to the Pennsylvania memorial site.
Seventeen years later it's still shocking to see the footage of the falling bodies, the towers collapsing, the thick clouds of dust chasing people down New York City streets and the firefighters and civilians in tears, covered in that dust.
"It's the anniversary of one of the worst tragedies in American history - and Donald Trump is PUMPED!" tweeted Chicago tribune columnist Rex Huppke. "But in its place has grown a new resolve to live our lives with the same grace and courage as the heroes of Flight 93".
The plane crashed as passengers and flight crew thwarted the hijacking by a group of terrorists 17 years ago.
Mr Trump listened as the names of the 40 victims were read aloud, followed by the tolling of bells.
He said it's important that each new generation know what happened. "And the people in NY fought and fought and fought". "They did not let the events unfold for them".
ABC's "The View" co-host and comedian Joy Behar belittled first lady Melania Trump on CNN's "Van Jones Show" recently, claiming that before Melania Trump met her now-husband President Donald Trump, she was "in Slovenia doing nothing".
And in Washington, Vice President Mike Pence spoke during the memorial observance at the Pentagon, where 125 people were killed when a jet was flown into the building.
In remembrance, Trump also posted "17 years since September 11th!" John McCain, pundits compared their speaking styles to that of Trump, who has drawn criticism for what detractors call an overly divisive tone when speaking at somber events ranging from his inauguration to the National Prayer Breakfast. Around 10 a.m., Flight 93 passengers became aware of what was happening on other flights, took a vote and made a decision to try and storm the aircraft's cabin. Some tearful readers mentioned how much they miss their loved ones.
In all, four planes were hijacked by Al-Qaeda militants who used them to topple the trade centre's twin towers and hit the Pentagon. Organisers of the ground zero ceremony allow politicians to attend, but they've been barred since 2011 from reading names or delivering remarks. "The terrorists who carried out these attacks sought not just to take the lives of our people and crumble buildings", he said.
Hours after the ceremony, two powerful light beams soared soar into the night sky from lower Manhattan in the annual "Tribute in Light".
The bell has been rung on every anniversary since 2002, when it was presented to NY by the City of London to honour those who died.
Almost 10,000 of them have had some form of cancer, according to the World Trade Center Health Program.
Thousands of victims' relatives, survivors, rescuers and others are expected at Tuesday's ceremony at the World Trade Center.
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