NEW YORK, NY - SEPTEMBER 11: People attend a commemoration ceremony for the victims of the September 11 terrorist attacks at the National September 11 Memorial and Museum fifteen years after the day on September 11, 2016 in New York City. Throughout the country services are being held to remember the 2,977 people who were killed in New York, the Pentagon and in a field in rural Pennsylvania. (Photo by Spencer Platt/Getty Images)
