THE TENSION: Combat Camera: A 9/11 Retrospective, Part 4

WASHINGTON (Sept. 11, 2007) - A memorial flag is illuminated near the spot where American Airlines Flight 77 crashed into the Pentagon on Sept. 11, 2001. Secretary of Defense Robert Gates is scheduled to host the Pentagon Sept. 11 Memorial observance for family members of those who were killed in the Sept. 11 attack on the Pentagon. (U.S. Navy photo by Mass Communication Specialist 1st Class Brandan W. Schulze.)

Retired fire chief Joseph Curry barks orders to rescue teams as they clear through debris that was once the World Trade Center Sept. 14, 2001, in New York. (Photo by Photographer's Mate 1st Class Preston Keres, USN.)

A New York City firefighter looks up at what remains of the World Trade Center Sept. 13, 2001, after its collapse following the Sept. 11 terrorist attack. (Photo by Photographer's Mate 2nd Class Jim Watson, USN.)

A rescue dog is transported with rescue gear out of the debris of the World Trade Center Sept. 15, 2001, in New York. The twin towers of the center were destroyed in the Sept. 11 terror attack. (Photo by Photographer's Mate 1st Class Preston Keres, USN.)

A fire fighter emerges from smoke and debris of the World Trade Center Sept. 14, 2001, in New York. The twin towers of the center were destroyed in the Sept. 11th terror attack. (Photo by Photographer's Mate 2nd Class Jim Watson, USN.)

A solitary firefighter stands amidst the rubble and smoke in New York City, Sept. 14, 2001. Days after the Sept. 11 terrorist attack, fires still burn at the site of the World Trade Center. (Photo by Photographer's Mate 2nd Class Jim Watson, USN.)