For Marrocolo and others, the anniversary of 9/11 is a time to remember and to remind others of the horror of that day.
"What concerns me is that I think people are starting to forget how horrible 9/11 was," Marrocolo said, ". . . and if I can't remember these precise details, I feel like my ability to explain the event becomes more difficult."
And so, she and others turn back the clock to 8:46.40 a.m. on Sept. 11, 2001.
MaryAnn Marrocolo, former emergency planner for New York City, who worked on the 23d floor of Seven World Trade Center.
"I was going through the Brooklyn-Battery Tunnel, and I had just come out of the tunnel on the Manhattan side when someone from my office called me and said a plane had just hit the World Trade Center. . . . At first I didn't believe him.
"I wasn't going to be able to get through all the traffic, so I walked from the tunnel to the trade center . . . and I ran through the plaza area to Seven World Trade Center.
"A lot of smoke and debris was falling from above. A couple of times, I looked up, and you could clearly see people standing at the edges of where the windows were broken, or they were actually falling through the sky. I saw maybe five or six people who were in the process of falling."
Marrocolo was inside the city's Emergency Operations Center (EOC) on the 23d floor when the second plane hit.
"There weren't any windows. We saw it on TV and you felt the building shake. . . . That's when we realized that this wasn't just a freak accident, that this was some orchestrated attack.
"We went down the stairs - 23 flights - and then we ended up in the lobby of Seven World Trade Center. . . . Outside, there was glass falling and things hitting the ground."