October 16, 1991: A 35-year-old civilian drives a pickup truck into a Fort Hood cafeteria and fatally shoots 23 people wounding 20 more before killing himself. It was the deadliest shooting rampage in American history until the Virginia Tech Massacre.
July 18, 2009: Thirty-year-old soldier from Wisconsin is shot and killed by a bullet fired during a party at Fort Hood. A fellow soldier is charged with the murder.
Sept. 8, 2008; A 1st Lieutenant goes looking for missing military equipment at an apartment near Fort Hood is shot and killed by a solider from Alabama, who then turns the gun on himself.
More coverage of the tragedy at Fort Hood:
Fort Hood Rampage Suspect Sill Alive
Ft. Hood Suspect ID'd as Army Psychiatrist
Soldier Opens Fire at Ft. Hood; 12 Dead
What was Shooter's Motive?
U.S. Army Base Violence Has Bloody History
Obama: Fort Hood Shooting "Horrific"
Fast Facts: Fort Hood
Tragedy at Fort Hood
In Fort Carson, Colorado, 14 soldiers allegedly committed or were charged with murder between 2005 and 2008 - and most were from the same brigade. An Army study concluded that the brigadeAnd in 11 of the 14 alleged murders there were documented problems with alcohol and drugs - less than half got help from the military.
Earlier this year, at Camp Liberty in Iraq, an army sergeant walked into a combat stress center and opened fire, killing five fellow soldiers. In the days leading up to the attack, that soldier allegedly had been acting erratically and had expressed suicidal thoughts. But a military report later pointed to a lack of guidelines for dealing with soldiers in distress.
"Such a tragic loss at the hands of our own forces is a cause for great and urgent concern," Defense Secretary Robert Gates said.