RecruitingBehavioural interventionManage Emotions to Reduce Aggression (MERA)PTSD is one of the most prevalent mental health conditions affecting Veterans who have served since 9/11. Veterans with posttraumatic stress disorder (PTSD) report difficulty controlling impulsive aggression (IA). An inability to manage one's emotions (emotion dysregulation) is an underlying mechanism of IA. Reducing IA and increasing use of PTSD evidence-based psychotherapies are two critical missions for the Veterans Health Administration. The proposed research supports these missions by comparing a 3- session emotion regulation treatment (Manage Emotions to Reduce Aggression) to a control group in order to determine if MERA can reduce IA and prepare Veterans for PTSD treatment. By enhancing Veterans' abilities to cope with trauma-related emotions and feel equipped to initiate PTSD treatments, this research aims to help Veterans decrease IA and ultimately recover from PTSD.