Inside the Pentagon during crisis

(CNN) -- It's been almost a year since September 11th, 2001 -- a day that changed our world. When a hijacked plane tore into the Pentagon that Tuesday morning, some of the people inside stayed on the job.

CNN NewsPass VIDEO CNN's Barbara Starr talks with Brigadier General Montague Winfield about September 11, 2001 (September 6) Play video

The National Military Command Center kept working, coordinating military operations worldwide, while much of the Pentagon was in flames. The Command Center is on the other side of the massive building and its staff never felt the impact, but they saw the flames on television as alarms went off inside, and they had to remain calm.

Barbara Starr has an exclusive look at what happened in the command center that day.