http://www.wsj.com/articles/police-pursue-gunman-in-chattanooga-tenn-1437065542
1.November 2009
U.S. Army Maj. Nidal Malik Hasan killed 13 people and wounded 31 during a shooting rampage at Fort Hood, weeks before he was set to be deployed to Iraq. Maj. Hasan, who worked as psychiatrist on the base, was sentenced to death in August 2013.
2.April 2014
For the second time in five years, an active-duty soldier went on a shooting rampage at Fort Hood in Killeen, Texas, killing three people at the U.S. Army post and wounding 16 others. Shooter Ivan Lopez turned the gun on himself.
3. Sep. 2013Aaron Alexis, a man who had been forced out of the military after a 2010 gun arrest, opened fire in a building at the Washington Navy Yard, killing 12. He died in a shootout with police.
4.March 2014 Jeffrey Savage, a convicted felon, shot and killed a U.S. sailor aboard a Navy destroyer docked in Norfolk, Va. The suspect, shot dead by security forces, had been able to drive onto the base in a truck, walk past a second checkpoint and fight his way on board the vessel.
5.July 2011
Army Pfc. Naser Jason Abdo was arrested after police said they believed the AWOL soldier was planning to attack Fort Hood. Mr. Abdo, sentenced to life in prison, planned to bomb a restaurant near the base and then to shoot any survivors, according to court testimony.