An Afghan soldier allegedly went on a rampage and killed four American civilians . Many of these people have experienced problems processing complex information . Eric Zillmer : Has psychological impact of U.S. war been underestimated ? He says the soldier 's horrific act can not be attributed solely to traumatic brain injury . Zillmer : Our military must do more to prepare troops for challenges in combat zones .
An Afghan soldier allegedly went on a rampage and killed four American civilians . Eric Zillmer : Has psychological impact of U.S. war been underestimated ? He says the soldier 's horrific act can not be attributed solely to traumatic brain injury . Zillmer : Our military must do more to prepare troops for challenges in combat zones .