Never before has this country seen so many women paralyzed by the psychological scars of combat. As of June 2008, 19,084 female veterans of Iraq or Afghanistan had received diagnoses of mental disorders from the Department of Veterans Affairs, including 8,454 women with a diagnosis of post-traumatic stress  and this number does not include troops still enlisted, or those who have never used the V.A. system.

Their mental anguish, from mortar attacks, the deaths of friends, or traumas that are harder to categorize, is a result of a historic shift. In Iraq and Afghanistan, the military has quietly sidestepped regulations that bar women from jobs in ground combat. With commanders needing resources in wars without front lines, women have found themselves fighting on dusty roads and darkened outposts in ways that were never imagined by their parents or publicly authorized by Congress. And they have distinguished themselves in the field.

Psychologically, it seems, they are emerging as equals. Officials with the Department of Defense said that initial studies of male and female veterans with similar time outside the relative security of bases in Iraq showed that mental health issues arose in roughly the same proportion for members of each sex, though research continues.

“Female soldiers are actually handling and dealing with the stress of combat as well as male soldiers are,” said Col. Carl Castro, director of the Military Operational Research Program at the Department of Defense. “When I look at the data, I see nothing to counter that point.”

And yet, experts and veterans say, the circumstances of military life and the way women are received when they return home have created differences in how they cope. A man, for instance, may come home and drink to oblivion with his war buddies while a woman  often after having been the only woman in her unit  is more likely to suffer alone.