This article offers guidelines for conducting preventive mental health interventions using a Critical Incident Stress Debriefing (CISD) model with Air Force and other aviation communities that have experienced a fatal aircraft mishap. The guidelines are based on the authors' experiences in providing assistance to several hundred active duty military personnel and their families following two separate mishaps. The article outlines the basics of the CISD model, briefly describes the two mishaps, and then discusses the lessons learned.