In earlier wars, it was called "soldier's heart," "shell shock," or "combat fatigue." Today, doctors recognize the issues described by each of these terms as a distinct medical condition called posttraumatic stress disorder, or PTSD.
According to an independent study conducted in 2008 by the Rand Corporation, one in five service members, or at least 300,000, suffer from post-traumatic stress disorder (PTSD) or major depression.
