The U.S. military has spent more than $42 million to test every service member's brain to find out who suffered a traumatic brain injury, or TBI, during the Iraq and Afghanistan wars. But an investigation by NPR and ProPublica has found that military leaders are refusing to carry out the testing program as Congress ordered. Partly as a result, the program that was supposed to fix things has hardly helped any of the troops.
On a recent morning, four dozen soldiers who were about to be deployed to Afghanistan filed into a squat wooden building at Fort Lewis, in Washington state.