This photograph, of New York firefighters, was taken on September 11th. It is from a special issue of Time magazine, published soon after the catastrophe.
Beneath the photo is the title "New York's Bravest," which is followed by this, about the day: "Fire fighters were still going in when the buildings collapsed. One ducked under his truck and emerged to find everyone else in his squad dead."
The picture was taken for Time by photographer James Nachtwey (VII Photo Agency).