Home New York City Police Officer Danny Shea, a military vet, salutes at the North pool of the 9/11 Memorial during the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, September 11, 2011 in New York City. (Photo by David Handschuh-Pool/Getty Images) New York City Police Officer Danny Shea, a military vet, salutes at the North pool of the 9/11 Memorial during the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, September 11, 2011 in New York City. (Photo by David Handschuh-Pool/Getty Images)

New York City Police Officer Danny Shea, a military vet, salutes at the North pool of the 9/11 Memorial during the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, September 11, 2011 in New York City. (Photo by David Handschuh-Pool/Getty Images)

NEW YORK, NY – SEPTEMBER 11: New York City Police Officer Danny Shea, a military vet, salutes at the North pool of the 9/11 Memorial during the tenth anniversary ceremonies of the September 11, 2001 terrorist attacks at the World Trade Center site, September 11, 2011 in New York City. New York City and the nation are commemorating the tenth anniversary of the terrorist attacks on lower Manhattan which resulted in the deaths of 2,753 people after two hijacked planes crashed into the World Trade Center. (Photo by David Handschuh-Pool/Getty Images)

A man falls to his death from the World Trade Center after two planes hit the twin towers September 11, 2001 in New York City in an terrorist attack. (Photo by Jose Jimenez/Primera Hora/Getty Images)
A woman touches a carnation left on a name inscribed into the North Pool during 9/11 Memorial ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York on September 11, 2013 in New York City. (Photo by Adrees Latif-Pool/Getty Images)