There are tests for heart attacks and diabetes, but few for brain disorders. Researchers are trying to change that, but are finding the hunt for biomarkers for mental illness to be a tough slog. Tests on the market, like ones for Alzheimer's, are not conclusive.

The fear and anxiety of post-traumatic stress disorder can be caused by medical crises like a stroke or heart attack, researchers say. They think that's partly due to the life-threatening medical emergency, and partly due to the chaos of the American health care system.

Suicide killed more U.S. troops last year than combat in Afghanistan, a trend that's likely to continue this year. The causes and remedies are complicated, but Fort Bliss in Texas has bucked the trend. Suicides have declined there, after implementation of an interactive suicide prevention program.

When Nicholas Rodriguez returned from Afghanistan in 2010, his mother and stepfather had never heard of post-traumatic stress disorder. It was only after Nick killed himself that they learned the warning signs and realized he needed help dealing with his combat experience.

Lanny Martinson was a 23-year-old Marine sergeant in Vietnam when he last saw his dog tags. In the 45 years since, he thought they were gone forever, lost in the mad rush to save his life and to help the men he was with when they walked into a minefield.

Twenty-two million Americans served in the military, but the vast majority are from the Vietnam and Korea generations. They're getting older now, and many live in rural or remote places like Alaska.

The Department of Veterans Affairs is being criticized for the shortfall in care for almost a million veterans who can't get timely compensation and have been waiting hundreds of days for help, often to no avail. But the agency says it's making progress.

When wounded combat veterans lash out, the Army struggles to respond justly.Locked Away: Army Struggles With Wounded SoldiersSgt. Paul Sasse arrived at鈥�

Modern medicine saved Sgt. Jerrald Jensen when he was injured in combat. Decades-old disciplinary rules awaited when he returned home.Left Behind: No鈥�

Post-Traumatic Stress Disorder and Traumatic Brain Injuries are the signature wounds of the wars in Iraq and Afghanistan.Another problem is starting to鈥�