Specifically, we hypothesised that: (1) plasma concentrations of NfL and GFAP would be significantly increased after TBI; (2) that combat TBI would be associated with worse psychiatric (anxiety, depressive and PTSD symptoms) and functional outcomes (employment status, 6 min walk distance25 and quality of life) and (3) that such outcomes and plasma concentrations of NfL and GFAP would be associated in patients after TBI. Here, GFAP is linked to post-traumatic stress disorder.