Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, the American flag is at half-mast after a ceremony commemorating the 13th anniversary of 9/11 that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, Fire and Rescue personnel stand at attention as the American flag is raised during a ceremony held by Kennedy’s Fire and Rescue personnel. Kennedy Fire and Rescue Services commemorated the 13th anniversary of 9/11 with a ceremony that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, Kennedy Space Center Fire Chief Richard Anderson, center and Commander of the Honor Guard James Dumont, left, share emotional words at the 9/11 memorial during a ceremony held by Kennedy’s Fire and Rescue personnel. Behind the pair are members of NASA's Protective Services. Kennedy Fire and Rescue Services commemorated the 13th anniversary of 9/11 with a ceremony that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, the 9/11 memorial emblem is shown during a ceremony held by Kennedy’s Fire and Rescue personnel. Kennedy Fire and Rescue Services commemorated the 13th anniversary of 9/11 with a ceremony that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, Fire and Rescue personnel salute or stand at attention as the American flag is raised during a ceremony held by Kennedy’s Fire and Rescue personnel. Kennedy Fire and Rescue Services commemorated the 13th anniversary of 9/11 with a ceremony that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, Fire and Rescue personnel gathered near the 9/11 memorial after a ceremony commemorating the 13th anniversary of 9/11 with a ceremony that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, Fire and Rescue personnel salute or stand at attention as the American flag is raised during a ceremony held by Kennedy’s Fire and Rescue personnel. Kennedy Fire and Rescue Services commemorated the 13th anniversary of 9/11 with a ceremony that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, Fire and Rescue personnel pause for a moment of silence during a ceremony commemorating the 13th anniversary of 9/11 at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, the 9/11 memorial is shown before a ceremony held by Kennedy’s Fire and Rescue personnel. Kennedy Fire and Rescue Services commemorated the 13th anniversary of 9/11 with a ceremony that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, Gabe Wingard and Steve Dudgeon, both with NASA's Protective Services, fold the commemorative flag during a ceremony held by Kennedy’s Fire and Rescue personnel. Kennedy Fire and Rescue Services commemorated the 13th anniversary of 9/11 with a ceremony that included a minute of silence at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann

Cape Canaveral, Fla. – At Fire Station 1 at NASA’s Kennedy Space Center in Florida, Fire and Rescue personnel pause for a moment of silence during a ceremony commemorating the 13th anniversary of 9/11 at 10:28 a.m., which was the moment of collapse of the north tower of the World Trade Center. Photo credit: Jim Grossmann