Dallas police Officer Andrew Litz falls frequently and can't walk across the room without help.
He sometimes uses a wheelchair or cane. He suffers seizures. He's confused and disoriented. He's in and out of the emergency room almost every week.
After three combat tours in Iraq, he suffers from post-traumatic stress disorder and a traumatic brain injury caused by a 2005 roadside bomb.
Litz was among the thousands of Americans who enlisted in the military during a burst of patriotism after the Sept. 11, 2001, terrorist attacks.
Now, a decade later, he has become a victim of the wars spawned by 9/11.