While the shooting tragedy at Fort Hood is shocking, this is not the first case of violence to hit U.S. military bases.

Less than four months ago, a soldier opened fire during a party on Ft. Hood, killing a fellow comrade. More than a year ago, a first lieutenant went to one of his soldier's apartments, looking for missing military equipment. He was murdered by one of his own. That accused killer then killed himself.

Earlier this year at Camp Liberty in Iraq, five soldiers died after an Army sergeant opened fire at a combat stress center. Apparently, that soldier had acted erratically in the days leading up to the attack. A military report released stated that there was a lack of guidelines for dealing with soldiers in distress.

Back here in Colorado Springs, 14 Fort Carson soldiers are accused of murder between 2005 and 2008. Most were from the same brigade and had documented problems with drugs and alcohol. Apparently, less than half of them got help from the Army. A study revealed that the brigade had “experienced slightly higher levels of combat than other brigades.”