Munley and her partner responded within three minutes after the shooting started. There was confusion, but she saw what was happening and reacted quickly. She was wounded several times but managed to bring down the suspect and no doubt saved lives.
Munley saw Hasan chasing a soldier and trying to shoot him again. She took two bullets but still managed to shoot the suspect and put an end to the murder spree.
"She was one of the first to arrive on scene and to take the suspect under fire, so she probably saved a lot of lives with her actions," said Army Chief of Staff George Casey.
Officials say Munley fired twice and Hasan immediately turned around and charged her. That's when he started shooting at her. She was wounded in both legs but she kept standing and kept firing. She struck him twice in the upper torso and he went down.
"She walked up and basically engaged him, and I think certainly, this could have been far worse," said Lt. Gen. Robert W. Cone, Fort Hood's base commander.
Munley, 34, is a mother of two, and her husband is a soldier at Fort Bragg in North Carolina. He flew to Fort Hood after the shooting. She is a former soldier who became a member of the base's civilian police department. Her boss says she did what she was trained to do.
"People are healthy, alive and walking around today because of the actions this officer took. She's a hero," said Chuck Medley, the director of emergency services.
Munley is now at the Metroplex Hospital. Her brother told ABC News that his sister had surgery Thursday night and is undergoing surgery again Friday because one of the bullets pierced an artery in her leg.