(CBS/AP) JOINT BASE LEWIS-McCHORD, Wash. - A soldier suspected of killing 16 Afghan villagers Sunday comes from Joint Base Lewis-McChord, one of the largest military installations in the U.S. and one that has seen its share of controversies and violence in the past few years.
The base, home to about 100,000 military and civilian personnel, has suffered a spate of suicides among soldiers back from war. The Army is investigating whether doctors at Lewis-McChord's Madigan Army Medical Center were urged to consider the cost of providing benefits when reviewing diagnoses of post-traumatic stress disorder.
Most famously, four Lewis-McChord soldiers were convicted in the deliberate thrill killings of three Afghan civilians in 2010.
The military newspaper Stars and Stripes called it "the most troubled base in the military" that year.
"It's another blow to this community," said Spc. Jared Richardson, an engineer, as he stood outside a barbershop near the base Sunday. "This is definitely something we don't need."
U.S. officials tell CBS News national security correspondent David Martin the shooter was a conventional soldier from a Stryker Brigade based at Lewsis-McChord, and was assigned to support a special operations unit engaged in a village stability operation, which usually entails training local militiamen to protect the area.
He was a sergeant, married with two children, who had served three tours in Iraq and began his first deployment to Afghanistan in December, a senior U.S. official tells the Associated Press.
Lewis-McChord, a sprawling complex of red brick buildings, training fields and forests, is about 45 miles south of Seattle and has grown quickly since the Sept. 11, 2001, terror attacks.
Officials there have said that any community the size of the base is bound to have its problems, and its reputation has been tarred by "a small number of highly visible but isolated episodes" that don't accurately reflect the remarkable accomplishments of its service members, including their work overseas and the creation of new programs to support returning soldiers.
The controversies have indeed been highly visible.
In 2010, a dozen soldiers from the base were arrested on a slew of charges that ranged from using drugs, beating up a whistleblower in their unit, and deliberately killing three Afghan civilians during patrols in Kandahar Province. Prosecutors at Lewis-McChord won convictions against four of the five who were charged in the killings.
After the first killing, the father of one of the soldiers called Lewis-McChord to report it and to say that more killings were planned. The staff sergeant who took the call didn't report it to anyone else, saying he didn't have the authority to begin an investigation in a war zone. By the time the suspects were arrested months later, two more civilians were dead.
Army Staff Sgt. Calvin Gibbs, of Billings, Mont., the highest ranking defendant, was. At his seven-day court martial at Lewis-McChord, Gibbs acknowledged cutting fingers off corpses and yanking out a victim's tooth to keep as war trophies, "like keeping the antlers off a deer you'd shoot."
There have been other episodes of violence involving the base's soldiers or former soldiers. A former soldier shot and injured a Salt Lake City police officer in 2010; he died when police returned fire.
On Jan. 1, a 24-year-old Iraq war veteran shot andbefore succumbing to the cold and drowning in a creek.
Last year, Lewis-McChord saw more suicides than ever before 12, up from 9 in each of the prior two years. The Army has seen more suicides at bases across the country since the wars in Iraq and Afghanistan began.
The toll at Lewis-McChord rose despite new efforts to counsel soldiers when they come home from war, including the creation of a suicide-prevention office.
In the past five years, about 300 patients at Madigan Army Medical Center at the base had their PTSD diagnoses reversed by a forensic psychiatry team, The Seattle Times reported this month. The Army is reviewing whether those doctors were influenced by how much a PTSD diagnosis can cost, in terms of a pension and other benefits.
At Coffee Strong, afor soldiers seeking to leave the Army, executive director Jorge Gonzalez said he was not surprised the shooter was from the base.
"Joint Base Lewis McChord has been bombarded with bad stories," said Gonzales, who served in the Army in Iraq in 2006. "We're not seeing the true costs of war, we're seeing soldiers committing suicide ... murder and domestic violence."
Richardson said the vast majority of the tens of thousands of soldiers at the base were professionals.
"It's unfortunate that these things keeping ending up at Joint Base Lewis-McChord," he said. "I promise you, not even a percent of those people are like this, but unfortunately it keeps happening. Things like this will continue until there is no more war."