“Original feasibility and reliability study testing the Defense Automated Neurobehavioral Assessment (DANA), which includes a description of its psychometric properties. Platform and Latency: DANA utilizes a native application on a smart phone or tablet to measure reaction time, which registers a response much faster than a web application. The overall response time of the DANA platform in this initial study was 6.8 milliseconds. By comparison, the input variability with a personal computer can range anywhere from 4-25 milliseconds. Accordingly, the response latency of DANA is more accurate and sensitive. Test Batteries: All of the cognitive tests and psychological assessments included in the test batteries of DANA meet the requirements of the American Psychological Association’s standard for tests and measurements and all tests are in the public domain. Tests were selected based upon their potential to address specific deployment-related concerns, such as concussion and combat distress or exhaustion. All tests have extensive literature regarding their reliability and validity. Cognitive tests cannot be learned or memorized, as test stimuli are generated at random and each test has practice trials before the actual test trials. Reliability and Validity Test Methods: DANA was administered to 224 active duty service members (officers and enlisted) from the Air Force, Navy, and Marine Corps, across 5 extreme operational environments (arctic, jungle, altitude, desert, shipboard). Collected data was analyzed for descriptive statistics, split-half reliability, test-retest reliability and cross-test correlations, and such data was compared to previously reported data from other computer-based neurocognitive assessments. Results: DANA was found to be a reliable instrument and compared favorably to other computer-based neurocognitive assessments. Benefits of DANA include that it (a) includes relevant psychological tests as well as standard cognitive tests; (b) is built on a portable OS with more precise timing than previous NCATs; and (c) is a portable handheld device, which is more versatile than a laptop computer. “