1 in 5 Returning Troops may Have Brain Injury

Bush's legacy:

As many as 20 percent of U.S. combat troops who fought in Iraq or Afghanistan leave with signs they may have had a concussion, and some do not realize they need treatment, Army officials said Thursday.

Concussion is a common term for mild traumatic brain injury, or TBI. While the Army has a handle on treating more severe brain injuries, it is "challenged to understand, diagnose and treat military personnel who suffer with mild TBI," said Brig. Gen. Donald Bradshaw, chairman of a task force on traumatic brain injury created by the Army surgeon general.