 In Operations Iraqi Freedom and Enduring Freedom OIFOEF, over 60 of combat casualties have been the result of explosive blasts, and many of these critical injuries involve trauma to the head. As a result, traumatic brain injury TBI has been deemed a signature wound of OIF and OEF. The symptoms of head injuries, particularly of concussionmild TBI mTBI, can be sever but subtle, suggesting that early and accurate diagnosis is paramount to a wounded warriors appropriate medical care. Most first providers in the war theater are medics who could benefit from an improved diagnostic test to better identify service members with concussionmTBI. The MACE cognitive test is heavily weighted towards memory, is not 100 specific, and does not preclude a diagnosis of concussion being rendered despite a score in the normal range. Thus, an objective test of neurocognitive function, such as the DANA Rapid, that can be rapidly administered in theater by a combat medic would be highly beneficial to accurate clinical diagnosis and timely treatment. The results of the present study will provide information on the predictive value of the newly developed DANA handheld computer in assisting in the diagnosis of concussion in service members who have been blast exposed. If the DANA Rapid exam proves to be equally or more accurate than the MACE in detecting cognitive deficits, these tests and the handheld computer will also contribute to improved health care for service members by minimizing the time between injury and diagnosis. 