Stress? You think?

The New York Times has an article by Timothy Williams about the latest tragedy in Baghdad:

The United States military said Monday that five American soldiers had been shot to death by a fellow soldier who opened fire on them at one of the biggest American bases in Baghdad, and that the suspected shooter was in custody. The killings appeared to be the worst case of soldier-on-soldier violence among the American forces based in Iraq since the invasion more than six years ago.
The shooting occurred at around 2 p.m. local time at Camp Liberty, part of the sprawling Camp Victory complex near Baghdad, according to a military statement. The names of the dead soldiers were being withheld pending family notification, the statement said. “Anytime we lose one of our own, it affects us all,” Colonel John Robinson, a spokesman for the American military in Iraq, said in the statement.
The attack took place at a clinic for soldiers who are seeking help for stress. CNN, citing identified officials, said that at least three others were wounded in the attack.
President Obama “was shocked by the news of this incident,” the White House press secretary, Robert Gibbs, said Monday. “He’s saddened to hear the news from Camp Victory,” Mr. Gibbs told reporters at the White House. “His heart goes out to all the families.”
Defense Secretary Robert Gates called the shooting “a great and urgent concern” at a news conference on Monday afternoon. The killing of American troops by their fellow soldiers is infrequent, but not unheard of. The latest incident in Iraq occurred in September, when an American soldier was arrested following the shooting deaths of two American soldiers at their patrol base near Iskandariya.
All three soldiers were assigned to the Third Battalion, Seventh Infantry Regiment, Fourth Brigade Combat Team, Third Infantry Division, based in Fort Stewart, Ga.
In November of 2006, Staff Sergeant Alberto Martinez, serving with the New York National Guard, was arraigned in a military court on charges of murdering two officers in an explosion at one of Saddam Hussein’s former palaces in Tikrit in June of 2005. And, in April of 2005, Sergeant Hasan Akbar, of the 101st Airborne Division, was sentenced to death for a grenade attack on his comrades in March of 2003 in Kuwait, at the beginning of the war. Sergeant Akbar was convicted of premeditated murder and attempted premeditated murder after he threw grenades into tents and then fired on soldiers, killing two officers and wounding 14 at Camp Pennsylvania in Kuwait.
About one in six soldiers returning from the war in Iraq shows signs of post-traumatic stress disorder or other emotional difficulties, according to a study published in The New England Journal of Medicine in 2004. The death toll from the Monday shooting was the highest for American personnel in a single attack since 10 April, when a suicide truck driver killed five American soldiers with a blast near a police headquarters in Mosul, news agencies reported.
Violence has dropped sharply in Iraq, but a rash of major bombings by insurgents has raised questions about security less than two months before American forces are due to withdraw combat troops from urban bases.
This month, two American soldiers were killed by a man wearing an Iraqi Army uniform at an Iraqi military training center south of Mosul.
In April, eighteen American military personnel members were killed in Iraq— double the number in March and the highest since September 2008, when 25 were killed.