For many of the 1.6 million U.S. service members who have served in Iraq and Afghanistan since 2001, the trip home is only the beginning of a longer journey. Many undergo an awkward period of readjustment to civilian life after long deployments. Some veterans may find themselves drinking too much, unable to sleep or waking from unspeakable dreams, lashing out at friends and loved ones. Over time, some will struggle so profoundly that they eventually...