While the authorities say they cannot yet tell us why an Army psychiatrist would go on a shooting rampage at Fort Hood in Texas, we do know the sorts of stories he had been dealing with as he tried to help those returning from Iraq and Afghanistan readjust to life outside the war zone. A soldier's mind can be just as dangerous to himself, and to those around him, as wars fought on traditional battlefields. 

War is haunting. Death. Pain. Blood. Dismemberment. A buddy dying in your arms. Imagine trying to get over the memory of a bomb splitting a Humvee apart beneath your feet and taking your leg with it. The first time I saw the stilled bodies of American soldiers dead on the battlefield is as stark and brutal a memory as the one of the grenade that ripped off my right arm and both legs.

No, the soldier never forgets. But neither should the rest of us. 

Veterans returning today represent the first real influx of combat-wounded soldiers in a generation. They are returning to a nation unprepared for what war does to the soul. Those new veterans will need all of our help. After America's wars, the used-up fighters are too often left to fend for themselves. Many of the hoboes in the Depression were veterans of World War I. When they came home, they were labeled shell-shocked and discharged from the Army too broken to make it during the economic cataclysm. 

So it is again, with too many stories about veterans of Iraq and Afghanistan ending up unemployed and homeless. Figures from the Department of Veterans Affairs show that 131,000 of the nation's 24 million veterans are homeless each night, and about twice that many will spend part of this year homeless. 

We know of the recent failures at Walter Reed Medical Center, where soldiers were stranded in substandard barracks infested with rats while awaiting treatment. I was in Walter Reed myself at that time seeking counseling for post-traumatic stress disorder, which, ignited by a barrage of Iraq headlines and the loss of my United States Senate seat, had simply consumed me. 

I never saw it coming. Forty years after I had left the battlefield, my memories of death and wounding were suddenly as fresh and present as they had been in 1968. I thought I was past that. I learned that none of us are ever past it. Were it not for the surgeons and nurses at Walter Reed, I never would have survived those first months back from Vietnam. Were it not for the counselors there today, I do not think I would have survived what I've come to call my second Vietnam, the one that played out entirely in my mind. 

When I was wounded, post-traumatic stress disorder did not officially exist. It was recognized as a legitimate illness only in 1978, during my tenure as head of the Veterans Administration under President Jimmy Carter. Today, it is not only recognized, but the Army and the V.A. know how to treat it. I can offer no better testament than my own recovery. 

Weeks before the troubles at Walter Reed became public in 2007, my counselor put it to me simply. "We are drowning in war," she said. The problems at Walter Reed had nothing to do with the dedicated doctors and nurses there. The problems had to do with the White House and Congress and the Department of Defense. The problems had to do with money. 

When we are at war, America spends billions on missiles, tanks, attack helicopters and such. But the wounded warriors who will never fight again tend to be put on the back burner. 

This is inexcusable, and it comes with frightening moral costs. There are estimates that 35 percent of the soldiers who fought in Iraq will suffer post-traumatic stress disorder. I'm sure the numbers for Afghanistan are similar. Researchers have found that nearly half of those returning with the disorder have suicidal thoughts. Suicide among active-duty soldiers is on pace to hit a record total this year. More than 1.7 million soldiers have served in Iraq and Afghanistan. Imagine that some 600,000 of them will have crippling memories, trapped in a vivid and horrible past from which they can't seem to escape. 

We have a family Army today, unlike the Army seen in any generation before. We have fought these wars with the Reserves and the National Guard. Fathers, mothers, soccer coaches and teachers are the soldiers coming home. Whether they like it or not, they will bring their war experiences home to their families and communities.