MILWAUKEE -- A remembrance ceremony was held to mark the 15 year anniversary of 9/11 on Sunday.
A piece of the World Trade Center stood at Milwaukee's War Memorial -- a reminder of all that has changed after those horrific events unfolded when hijackers steered airplanes into each World Trade Center tower, the Pentagon and when Flight 93 crashed in Pennsylvania.
Milwaukee Police Chief Ed Flynn was at the Pentagon on the day of the attacks. At Sunday's ceremony, he laid a wreath in memory of the 60 police officers killed.
"The first line of defense domestically for our democracy is our police officers and they are the ones that terrorists seek out to attack in order to stop people of their protections," Flynn said.
Three-hundred and forty-three firefighters were also among the nearly 3,000 people killed that day.
More than 6,000 other victims were injured in the attacks.