An FDNY battalion honored firefighters who lost their lives in the Sept. 11 terror attacks.

The FDNY lost 343 firefighters on 9/11 and many more from related illnesses over the years.

Even though it's been 16 years since 9/11, the pain is still fresh for firefighter Keith McElwain.  

More than 20 of his brave brothers from Battalion 57 lost their lives as the towers collapsed.  Their bodies were never recovered from the rubble.

Every year since, McElwain leads a march in their memory from ground zero across the Brooklyn Bridge. Flags are carried for every Battalion 57 firefighter lost. 

Thomas Palombo's father perished when he was only 9 years old. 

"It means a lot to be able to bring my father home for the day. It's very nice just to have a memory, that the memory lives on in him - in all the men," he says.