Across history, the condition has been called soldier's heart, shell shock, or combat fatigue. It is now increasingly common as our service men and women return from Iraq, Afghanistan, and other ongoing combat zones. Since 1990, Veterans' centers here have treated more than 1.6 million affected men and women, including an estimated 100,000 from the Gulf War and an untallied total from the Iraq front and fighting in Afghanistan. The number also includes some 35,000 World War II veterans, because PTSD does not fade easily. Regardless of the months, years, and even decades that have passed,...