The distant rumble of big guns on Fort Hood's artillery range rattles the ceiling tiles in the small military courtroom.
But the sounds of war training don't interrupt the intensity inside the military hearing as dozens of witnesses here recall that day last November when 13 people were shot to death and 32 wounded on the base in central Texas.
Training with Paladin howitzers is part of everyday life at Fort Hood, the country's largest Army base. Most of the shooting victims were preparing to ship out to the battlefields of Iraq and Afghanistan.
But nothing prepared them for what happened to them at home - dodging bullets as a gunman cut down their buddies.