Only yesterday they had laid another brother to rest, fireman Peter Bielfeld of Ladder Company 42 in the Bronx, whose remains were finally identified from DNA only a few weeks ago. Officer Bielfeld, 44, was off-duty on 11 September, seeking a medical review to take early retirement, when the call came through that a plane had hit the World Trade Center. He grabbed spare equipment from a nearby deserted fire station and headed, never to return, to the twin towers.