The euphoria of a soldier's homecoming from Iraq often gives way to depression, stress and trouble dealing with family members during the first months home, a new Pentagon study finds.

And the adjustment struggle was more profound for National Guard troops and reservists than it was for active-duty soldiers.

About 42 percent of the Guard and reserves, compared to 20 percent of active-duty troops, were identified as needing mental health treatment in two screenings. The first testing was immediately upon return from Iraq and the second six months later