RecruitingPhase 2Drug trialPrecision Biomarkers to Detect Brain Injury in Active-Duty United States Special Operations Forces With Repeated Blast ExposureThis is a 4-year, longitudinal study of 100 active-duty Navy SEALs. The goal of the study is to determine whether repeated blast exposure affects SEAL brain health and to develop an initial diagnostic testing protocol that detects repeated blast brain injury.