Peer Delivered, Emotion Regulation-Focused Mental Health Prevention Training for Fire Fighter Trainees

The goal of this clinical trial is to determine if a peer-delivered emotion regulation training (Brief-Unified Protocol) workshop is effective for preventing posttraumatic stress and other psychological health symptoms in firefighter trainees. The main questions it aims to answer are: * Do firefighter recruits who receive peer-delivered Brief-Unified Protocol report lower PTSD symptom severity over time compared to those who receive psychoeducation? * Do firefighter recruits who receive peer-delivered Brief-Unified Protocol report lower AUD, depression, anxiety, and functional impairment symptom severity over time compared to those who receive psychoeducation? * Do changes in neuroticism or emotion regulation mediate the effect of receiving the Brief-Unified Protocol on the treatment outcomes? Participants will: * Participate in a Brief-Unified Protocol workshop or psychoeducation workshop during fire academy training. * Complete a questionnaire prior to the workshop. * Complete a questionnaire immediately following the workshop and follow up questionnaires at 6, 12, 18, and 24 months after completing the fire academy. Researchers will compare firefighters who receive a peer-delivered Brief-Unified Protocol workshop to firefighters who receive peer-delivered psychoeducation to see if the Brief-Unified Protocol is effective for preventing posttraumatic stress and other psychological health symptoms.