On the day after the attack, Federal Emergency Management Agency (FEMA) Urban Search and Rescue (US&R) technical teams evaluated how to make the Pentagon crash site safer for rescue workers.
Photo: Jocelyn Augustino/ FEMA News Photo

The collapsed section of the Pentagon building was inspected safely from a crane basket.
Photo: Jocelyn Augustino/ FEMA News Photo

Firefighters and military personnel together unfurled the flag over the side of the Pentagon near the crash site.
Photo: Jocelyn Augustino/ FEMA News Photo

US&R crews built columns to support the collapsed structure.
Photo: Jocelyn Augustino/ FEMA News Photo

US&R crews cleared debris and strengthened support at the crash site.
Photo: Jocelyn Augustino/ FEMA News Photo

Heavy shoring and fallen debris at the Pentagon.
Photo: Jocelyn Augustino/ FEMA News Photo

Gus, a rescue dog with Tennessee Task Force One Search & Rescue, searched for survivors on the third say after the Pentagon attack.
Photo: Jocelyn Augustino/ FEMA News Photo

A temporary gravel pad was built so heavy machinery could clear rubble from the disaster site.
Photo: Jocelyn Augustino/ FEMA News Photo

One week after the attack, debris removal workers paused during their efforts to raise the collapsed Pentagon roof.
Photo: Jocelyn Augustino/ FEMA News Photo

Nighttime view of the damaged Pentagon building, with Washington D.C. in the background.
Photo: Jocelyn Augustino/ FEMA News Photo