Sixteen years after the 343 New York City firefighters who died in the collapse of the twin towers on 9/11 were honored at an annual ceremony in Colorado Springs, another wave of victims of the terrorist attack is being added to the memorial wall. Nineteen of the 271 union firefighters whose names were read out at this year’s Fallen Fire Fighter Memorial on Saturday in Memorial Park died of illnesses or conditions associated with the aftermath of the attack when firefighters were called upon to dig through the toxic rubble at what came to be known as ground zero, at first hoping to rescue survivors, then hoping to at least find remains. The numbers are only expected to increase.