“Independent study conducted to test the validity of DANA as a tool to diagnose concussion in a remote, deployed environment, as compared to an established measure of concussion screening, the Military Acute Concussion Evaluation (MACE). Selection of DANA for Study: The investigators selected DANA because it is “a durable and portable neurocognitive assessment tool that can be self-administered on a handheld device, making it well-suited for military operations and/or extreme environments as well as the sideline of a sports field.” Methods: MACE and DANA were administered to 40 male U.S. Marines deployed in Afghanistan who had not sustained a concussion within past 3 months. MACE and DANA were administered again at 24 hours and 48 hours after baseline assessment. Results – Validity and Utility: Validity of DANA to provide accurate assessments confirmed. Portability and durability of DANA, its shorter test time, and its lack of need for a medical professional to diagnose concussion overcome the critical limitations of MACE. Practice/Learned Effects: No evidence of practice effects improving performance despite investigators’ original hypothesis that repeated DANA testing would result in improvements in performance.”