The app will operate much like a video game. Service members will perform a baseline series of on-screen exercises during which both their speed and accuracy will be recorded. Service members who may have had a serious head injury will then participate in a series of both cognitive efficiency tests and self-administered questionnaires. Afterward, a clinician will review the results, comparing them to the results of the baseline exercises. The combination of the app’s cognitive and psychological components allows for insight into the prevalence of symptoms related to both traumatic brain injury and post-traumatic stress disorder.