Memorial services across the country honored the victims of 9/11 over the weekend.
Several communities have also erected monuments to the slain in the last 10 years.
John and Georgette Gill used the anniversary of the terrorist attacks to visit one of those monuments in Palm Beach Gardens, Fla.
Their son's name is inscribed along with the nearly 3,000 names of the victims of the September 11, 2001 attacks on New York City and Washington, D.C.
Paul John Gill was a 34-year-old New York City firefighter. He died rescuing people from the Marriott Hotel, which was located between the two World Trade Center towers.
"He was not supposed to be on duty that day. He went in because he was working overtime. So he kissed his son Joshua goodbye just as he left him off for school," John said.
"But he went in and he took someone's place. And they got the call and they were one of the first responders on the scene," he added.
"He had to have been afraid, but he went in anyway. They all did," Paul's stepmother, Georgette, said.
The Gills say the monument in Florida is a place of comfort. They say that it is a constant reminder that their son is remembered.
They also want people to remember all of the soldiers killed in the wars in Iraq and Afghanistan and to celebrate those who are still fighting, so that our country can remain free.