RecruitingBehavioural interventionEnhancing Resiliency and Optimizing Readiness in Military PersonnelSecurity Force Assistance Brigades (SFABs) are specialized United States Army units formed to train, advise, assist, enable and accompany operations with allied and partner nations. Security Force Assistance Brigades are composed of roughly 800 senior military personnel, primarily commissioned and non-commissioned officers selected from regular Army units across a wide range of military specialties. Because of the high operational tempo (OPTEMPO) of these units, individual resiliency is of utmost importance in maintaining readiness to successfully execute critical, high-stress missions. Acceptance and Commitment Training (ACT) is an evidence-based intervention with strong potential to enhance resiliency by bolstering psychological flexibility along with other factors which have been demonstrated to optimize individual and group performance. This project will compare an Acceptance and Commitment Training-based resiliency-enhancement training program as compared to training as usual in 600 3rd Security Force Assistance Brigades soldiers stationed at Fort Hood in Killeen, Texas. Assessment measures related to resilience will be administered before and after training as well as before and after deployment. Assessments will be conducted at baseline, and every 4 months thereafter for a total of 16-months.