Moral injury merits further study to clarify its identification, prevalence, assessment and intersection with psychosocial and psychiatric problems. The present study investigated the screening potential of the Brief Moral Injury Screen (BMIS) in a sample of post‐9/11 veterans (N = 315) and comparatively evaluated how this tool, the Moral Injury Events Scale (MIES), and the Moral Injury Questionnaire‐Military Version (MIQ‐M) relate to psychiatric diagnoses and mental illness symptom severity.