Campbell graduate wounded in Fort Hood shooting

Second Lt. John Arroyo suffered a gunshot wound to the neck and is recuperating after undergoing surgery, Campbell officials said.

Three people who were critically injured in the attack improved to fair condition Friday at Scott & White Memorial Hospital in Temple. A fourth victim was expected to be released later in the day. At the military's request, the hospital said, it would not make the wounded or their families available for media interviews.

Fort Hood was Arroyo's first assignment after his May 2013 graduation from Campbell, where he was cadet battalion commander in the Reserve Officer Training Corps.

Gloria Rendon, student services manager at Campbell, said Arroyo is a husband, a father of two and "a man of God."

"When it involves somebody that you know and have been fond of for a long time, somebody you care about, somebody in our academic community, it's scary. It's real. It makes the trauma real," she said.

The investigation at Fort Hood turned to focus on an argument between gunman Spc. Ivan Lopez had with soldiers in his unit Wednesday's attacks.

The base's commander, Lt. Gen. Mark Milley said that an "escalating argument" precipitated the assault.

Wednesday's attack was the second at the base since 2009, when 13 people were killed by Army psychiatrist Nidal Hasan, who had said he was angry about being deployed to Afghanistan.

Lopez, an Army truck driver, did a short stint in Iraq in 2011 and told medical personnel he had suffered a traumatic brain injury. The 34-year-old was undergoing treatment for depression and anxiety while being evaluated for post-traumatic stress disorder, base officials said.

But officials said Lopez did not see any combat in Iraq, and had not previously demonstrated a risk of violence.

He seemed to have a clean record that showed no ties to potential terrorists, though military officials said the investigation was ongoing.