Violence Abroad, Horror at Home: Recipe for PTSD?

Army Specialist Jonathan Pacheco, who returned from Iraq in May, described Fort Hood as a haven of sorts for soldiers who had been on the battlefront.

In a Tuesday, Dec. 2007 file photo, soldiers from the 1st Cavalry Division and 13th Sustainment...

In a Tuesday, Dec. 2007 file photo, soldiers from the 1st Cavalry Division and 13th Sustainment Command stand in formation during a homecoming ceremony at Fort Hood, Texas. The Army says 13 people were killed and 31 wounded in a pair of shootings at the Fort Hood Army base in Texas. An Army spokesman at the Pentagon says the shootings began about 1:30 p.m. Thursday, Nov. 5, 2009 at a personnel and medical processing center at Fort Hood.

(Steve Traynor/Killeen Daily Herald/AP Photo)

But after Army psychiatrist Maj. Nidal Malik Hasan allegedly opened fire on soldiers and others at the base, the troops at Fort Hood were forced to face the reality that even the home front can be violent.

"Everybody is on edge," Pacheco said. "Nobody was expecting it. Everybody thought they were safe."

Feelings of safety may indeed be a precious commodity at the base, located near Killeen, Tex. According to the website iCasualties.org, Fort Hood has suffered more in this decade than any other United States home base – 483 deaths in Iraq and more than 20 in Afghanistan.

Pacheco said everyone on the base is acutely aware of the losses overseas. But few of the troops likely expected this type of violence at home.

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And experts in post-traumatic stress disorder, or PTSD, said that before any of the troops close to this incident are redeployed, they should undergo extensive counseling.

"Anybody who's been through this event today would need to be assessed in terms of evidence of any traumatic symptoms, there needs to be a follow up in some days to look at a bigger clinical picture," said Dr. James Griffith, professor of psychiatry and neurology at the George Washington University School of Medicine in Washington, D.C.

"If someone is showing symptoms [of PTSD], then I would advise against them against going into combat."

A senior military official confirmed to ABC News on Thursday that the unit that was at the readiness center at the time of the shootings was getting ready to deploy to Iraq. Col. Benton Danner, a media spokesman for Fort Hood, could not immediately tell ABC News what, if any additional counseling will now be provided to soldiers who were preparing to deploy and witnessed this event.