Inspired by this background, we analysed tau PET data that had been acquired using [18F]AV1451 PET from the Alzheimer's Disease Neuroimaging Initiative-Department of Defense (ADNI-DOD) study of nondemented Vietnam War veterans suffering from service-related TBI, PTSD, and comorbid TBI with PTSD. Here, MAPT is linked to post-traumatic stress disorder.