FORT HOOD — Update 1:39 p.m.: During the height of the November 2009 shooting, Sgt. First Class Maria Guerra barricaded herself and two others in her office and listened to the rapid fire of gunshots and screaming of victims. Amid the chaos, she heard a woman’s voice yell out “Please, don’t, please don’t! My baby, my baby!” It was an apparent reference to Pvt. Francheska Velez, a 21-year-old from Chicago who had just returned from Iraq and was pregnant when she was killed during the rampage. Moments later she heard gunshots and the voice go silent. At that point Thursday,...