Even before the Fort Hood shooting ended, nurses and medics rushed to help the wounded.
"Nurses and medics get the [expletive] out here now - we have soldiers bleeding," Sgt. First Class Maria Guerra recalled herself yelling.
"You train for this, you train for this, let's go," she said as civilians and soliders came out of hiding to save their fallen buddies.
Guerra, testifying Tuesday at a military hearing, told how she could still hear shooting outside the building as she secured the doors with her own belt.
She saw the shooter, whom she later identified as Army Maj. Nidal Hasan, walking and firing his weapon. She said she recognized Hasan from an argument a week earlier over getting his small pox vaccination.
Read the full story on CNN.com.