CNN:

Yet now, after all the wreckage has been cleared and the rebuilding has begun, their path is again blocked — not by flying chunks of smoldering rubble, but by space constraints.The first responders are not invited to this year’s September 11 memorial ceremony at ground zero, New York City Mayor Michael Bloomberg’s office confirmed Monday.

They weren’t invited in 2001 either, but they showed up. Much respect to those people.